Fix progress bar display.

Closes #12
Added text when there are no filter results.

Closes #7
Move value filter implementations to external classes.

Create a new CollectionFilter class towards issue #4
Remove CollectionFilter -- it doesn't seem like the right approach for
now.
Clean out lint warnings.
Refactor loading to make it cleaner and less layered.
Add JavaDoc documentation, and make the Reader-based version of
readCSV() private until we actually need it.
Add basic support for fragment identifiers.

Closes #4
Hide deprecation warning (for now).
Closed #5
Use proper return key label when searching.

Closes #13
Change info bar background depending on filtering status.

Closes #8
Final updates for first Google Play release.