* Added mod 3 dev challenge guidelines and intro pages
* Added instructions to set up Genymotion
* Added instructions to handle ActionBarActivity issue when creating a new Activity
* Added images to Genymotion setup instructions
* Added code change highlighting for ActionBarActivity issue
* Moved Genymotion instructions from android-setup to android-hello-world
* Added links to instructions from lesson 2 of mod1
* Added recommendation of real device and Genymotion over Android emulator
* Deleted challenge content
Merge pull request #3 from vinaygopinath/master

Mod3 dev challenge guidelines, Genymotion and ActionBar