updates to package_index.json to support ARM build

package_index.json.diff

--- package_index.json	2015-12-28 16:48:07.000000000 +0100
+++ test_package_arm_index.json	2016-01-28 17:54:04.000000000 +0100
@@ -620,6 +620,13 @@
           "version": "4.8.3-2014q1",
           "systems": [
             {
+              "host": "arm-linux-gnueabihf",
+              "url": "http://downloads.arduino.cc/gcc-arm-none-eabi-4.8.3-2014q1-linux64.tar.gz",
+              "archiveFileName": "gcc-arm-none-eabi-4.8.3-2014q1-linux64.tar.gz",
+              "checksum": "SHA-256:d23f6626148396d6ec42a5b4d928955a703e0757829195fa71a939e5b86eecf6",
+              "size": "51395093"
+            },
+            {
               "host": "i686-mingw32",
               "archiveFileName": "gcc-arm-none-eabi-4.8.3-2014q1-windows.tar.gz",
               "url": "http://downloads.arduino.cc/gcc-arm-none-eabi-4.8.3-2014q1-windows.tar.gz",
@@ -824,6 +831,13 @@
           "version": "4.8.1-arduino5",
           "systems": [
             {
+              "size": "24403768",
+              "checksum": "SHA-256:c8ffcd2db7a651b48ab4ea19db4b34fbae3e7f0210a0f294592af2bdabf2154b",
+              "host": "arm-linux-gnueabihf",
+              "archiveFileName": "avr-gcc-4.8.1-arduino5-armhf-pc-linux-gnu.tar.bz2",
+              "url": "http://downloads.arduino.cc/tools/avr-gcc-4.8.1-arduino5-armhf-pc-linux-gnu.tar.bz2"
+            },
+            {
               "size": "24437400",
               "checksum": "SHA-256:111b3ef00d737d069eb237a8933406cbb928e4698689e24663cffef07688a901",
               "host": "i386-apple-darwin11",
@@ -858,6 +872,13 @@
           "version": "6.0.1-arduino5",
           "systems": [
             {
+              "size": "267095",
+              "checksum": "SHA-256:23ea1341dbc117ec067f2eb1a498ad2bdd7d11fff0143c00b2e018c39804f6b4",
+              "host": "arm-linux-gnueabihf",
+              "archiveFileName": "avrdude-6.0.1-arduino5-armhf-pc-linux-gnu.tar.bz2",
+              "url": "http://downloads.arduino.cc/tools/avrdude-6.0.1-arduino5-armhf-pc-linux-gnu.tar.bz2"
+            },
+            {
               "size": "264894",
               "checksum": "SHA-256:41af8d3b0a586853c8317b4fb5163ca0db594a1870ddf680fd988c42166fc3e5",
               "host": "i386-apple-darwin11",
@@ -892,6 +913,13 @@
           "version": "1.5-arduino",
           "systems": [
             {
+              "host": "arm-linux-gnueabihf",
+              "url": "http://downloads.arduino.cc/bossac-1.5-arduino2-arm-linux-gnueabihf.tar.bz2",
+              "archiveFileName": "bossac-1.5-arduino2-arm-linux-gnueabihf.tar.bz2",
+              "checksum": "SHA-256:7b61b7814e5b57bcbd853439fc9cd3e98af4abfdd369bf039c6917f9599e44b9",
+              "size": "199550"
+            },
+            {
               "host": "i686-mingw32",
               "url": "http://downloads.arduino.cc/bossac-1.5-arduino2-mingw32.tar.gz",
               "archiveFileName": "bossac-1.5-arduino2-mingw32.tar.gz",
@@ -960,6 +988,13 @@
           "version": "1.6.1-arduino",
           "systems": [
             {
+              "host": "arm-linux-gnueabihf",
+              "url": "http://downloads.arduino.cc/bossac-1.6.1-arduino-arm-linux-gnueabihf.tar.bz2",
+              "archiveFileName": "bossac-1.6.1-arduino-arm-linux-gnueabihf.tar.bz2",
+              "checksum": "SHA-256:8c4e63db982178919c824e7a35580dffc95c3426afa7285de3eb583982d4d391",
+              "size": "201341"
+            },
+            {
               "host": "i686-mingw32",
               "url": "http://downloads.arduino.cc/bossac-1.6.1-arduino-mingw32.tar.gz",
               "archiveFileName": "bossac-1.6.1-arduino-mingw32.tar.gz",
@@ -994,6 +1029,13 @@
           "version": "0.9.0-arduino",
           "systems": [
             {
+              "host": "arm-linux-gnueabihf",
+              "url": "http://downloads.arduino.cc/tools/OpenOCD-0.9.0-arduino-arm-linux-gnueabihf.tar.bz2",
+              "archiveFileName": "OpenOCD-0.9.0-dev-arduino-arm-linux-gnueabihf.tar.bz2",
+              "checksum": "SHA-256:a84e7c4cba853f2c937d77286f8a0ca317447d3873e51cbd2a2d41424e044a18",
+              "size": "1402283"
+            },
+            {
               "host": "i686-mingw32",
               "url": "http://downloads.arduino.cc/tools/OpenOCD-0.9.0-arduino-i686-pc-cygwin.tar.bz2",
               "archiveFileName": "OpenOCD-0.9.0-arduino-i686-pc-cygwin.tar.bz2",
@@ -1028,6 +1070,13 @@
           "version": "4.0.0-atmel",
           "systems": [
             {
+              "host": "arm-linux-gnueabihf",
+              "url": "http://downloads.arduino.cc/CMSIS-4.0.0.tar.bz2",
+              "archiveFileName": "CMSIS-4.0.0.tar.bz2",
+              "checksum": "SHA-256:7d637d2d7a0c6bacc22065848a201db2fff124268e4a56868260d0f472b4bbb7",
+              "size": "17642623"
+            },
+            {
               "host": "i686-mingw32",
               "url": "http://downloads.arduino.cc/CMSIS-4.0.0.tar.bz2",
               "archiveFileName": "CMSIS-4.0.0.tar.bz2",