Adds mock gallery items provider and basic observable flow
Applies auto-reformat with correct settings
Renames observable method in GalleryItemsProvider.

- can rename if it gets to a point where there are multiple
Changes package name, reduces code
Updates retrofit to 1.5
Adds correct schedulers
Adds logs to onNext and onCompleted
Adds working api observabe (scheduling fix)
Fixes image url for albums
Adds simple list item styling for gallery
Adds second style for gallery item view
Adds more padding to textview
Extracts Observer in Activity, fixes View recycling with types, simplifies observable
Specifies scheduler for subscribesOn
Adds third view type
Removes unused code (sql provider)
Removes unused dependencies
Adds ApiConstants with mock value so builds out of box
Removes ApiConstants from tracked files
Readds ApiConstants