Move Activity and Fragment related operations to rx.android.app

This aligns the package name of Android framework classes.
Merge pull request #92 from omo/content-to-app

Move Activity and Fragment related operations to rx.android.app
Hide ViewActions implementation details. Javadoc normalization.
Fixed broken builds in IntelliJ

To be honest, not even sure how it was building command-line, but now
it's no longer double-including all its funky dependencies.
Merge pull request #102 from dlew/dlew/fix-build

Fixed broken builds in IntelliJ
Remove redundant documentation.
Merge pull request #104 from ReactiveX/jw/useless-javadoc

Remove redundant documentation.
Added reactive versions of main Activities/Fragments

Includes both built-in versions + support versions.

Minus any sort of weird annotation hacking, this seems to be the "best" method
for creating a version of the base UI component classes that we can hook into.
Added sample Activity demonstrating LifecycleObservable
Add Rx utilities to ReactiveDialog
Merge pull request #93 from dlew/dlew/reactive-ui

Added reactive versions of Activities and Fragments
Merge pull request #96 from ReactiveX/jw/hide-all-the-things

Hide ViewActions implementation details. Javadoc normalization.
Update README.md
Merge pull request #107 from aried3r/patch-1

Update README.md
io.reactivex:rxjava:1.0.+
Unified imports style
Reverted Click, TextChange and CheckedChange Observables to use simple
objects instead of immutable events; changed corresponding tests back as well.