Add crashlytics-build.properties into `.gitignore`

not sure how it comes into our code... :flushed:
Add recycler view as a base fragment. :yum:

Like the ListFragment, it has a progress bar and it' s refreshable.
StaggeredGrid with the Hacker News item :smiley:

needs improvement and simplicity.
Amend the missing palette lib :pensive:

NOTE: It shoule be pushed to the maven central repo.
Add the missing REAMED and Screenshot :ok_hand:

early previwe 0.01 done.