===
- http://reactivex.io/documentation/observable.html
- http://try.kotlinlang.org/#/UserProjects/pcp2sc9ic1cc19mn4c9ko8mpe8/r0pokcmocihe2m3v6l6q51aked
- https://github.com/Reactive-Extensions/RxJS/blob/master/doc/gettingstarted/creating.md#cold-vs-hot-observables
- https://leecampbell.com/2010/08/19/rx-part-7-hot-and-cold-observables/
- http://rxmarbles.com/
- http://www.introtorx.com/Content/v1.0.10621.0/05_Filtering.html#SkipAndTake
- https://github.com/ReactiveX/RxKotlin/blob/0.x/src/main/kotlin/rx/lang/kotlin/subscribers.kt
- https://kotlinlang.org/docs/reference/inline-functions.html
- https://medium.com/@juanchosaravia/learn-kotlin-while-developing-an-android-app-part-2-e53317ffcbe9#.55tcqwm2d
- https://medium.com/@juanchosaravia/keddit-part-3-extension-functions-android-extensions-and-more-faa7d232f232#.t851r16go
- https://medium.com/@juanchosaravia/keddit-part-5-kotlin-rxjava-rxandroid-105f95bfcd22#.g7arljxby
- https://medium.com/@juanchosaravia/keddit-part-6-api-retrofit-kotlin-d309074af0#.a7dw1ij2j
- http://antonioleiva.com/kotlin-awesome-tricks-for-android/
- https://github.com/Kotlin/anko
- https://www.bignerdranch.com/blog/what-is-functional-reactive-programming/
- http://antonioleiva.com/kotlin-awesome-tricks-for-android/
- https://github.com/Kotlin/anko
- https://github.com/ReactiveX/RxJava/wiki
- https://github.com/ReactiveX/RxJava/wiki/Observable#establishing-subscribers
- https://medium.freecodecamp.com/descartes-berkeley-and-functional-reactive-programming-18b0b61eac58#.iqrapvpzx
- http://futurice.com/blog/reactive-c-number-in-practice
- https://medium.freecodecamp.com/rxandroid-and-kotlin-part-1-f0382dc26ed8#.872svz211
- https://docs.google.com/document/d/1ReS3ep-hjxWA8kZi0YqDbEhCqTt29hG8P44aA9W0DM8/edit#heading=h.rz87mso86x8i
- http://blog.translusion.com/posts/swift-is-kotlin/
- http://conal.net/blog/posts/another-angle-on-functional-future-values
- https://github.com/Reactive-Extensions/RxJS/blob/master/doc/gettingstarted/creating.md#cold-vs-hot-observables
- http://blog.danlew.net/2015/12/08/error-handling-in-rxjava/