Cleaner format for Mac OS X Mavericks screenshots. See http://apple.stackexchange.com/questions/53422/save-screenshot-with-my-own-name#53470

ScreenCapture.strings

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>%@ %@</key>
	<string>%@ %@</string>
	<key>%@ %@ at %@</key>
	<string>%@-%@_%@</string>
	<key>%@ %@(%@)</key>
	<string>%@ %@(%@)</string>
	<key>%@ (%@)</key>
	<string>%@ (%@)</string>
	<key>-</key>
	<string>-</string>
	<key>.</key>
	<string>.</string>
	<key>Cannot write file to intended destination.</key>
	<string>Cannot write file to intended destination.</string>
	<key>Failure to write image data.</key>
	<string>Failure to write image data.</string>
	<key>OK</key>
	<string>OK</string>
	<key>Screen Shot</key>
	<string>screenshot</string>
	<key>Unable to capture desktop image.</key>
	<string>Unable to capture desktop image.</string>
	<key>Unable to capture window image.</key>
	<string>Unable to capture window image.</string>
	<key>Unable to create type string.</key>
	<string>Unable to create type string.</string>
	<key>Unable to create url for path.</key>
	<string>Unable to create url for path.</string>
	<key>You dont have permission to save files in the location where screen shots are stored.</key>
	<string>You don’t have permission to save files in the location where screen shots are stored.</string>
	<key>dvderror</key>
	<string>Screen grabs are unavailable during DVD playback.</string>
	<key>dvderrormessage</key>
	<string>Please quit DVD Player first.</string>
	<key>yyyy-MM-dd</key>
	<string>yyyy-MM-dd</string>
</dict>
</plist>

Also works for Yosemite.

Disable shadows is:

defaults write com.apple.screencapture disable-shadow -bool true