Created a library with some sample tracks

The filenames have been slightly simplified, and I actually don't know
that the URIs are formatted in a way Android likes.
Replaced HomeActivity with LibraryActivity.

Effectively unchanged, but the new activity has an action bar.
Library activity now displays a list of track IDs

Removed the unit test referencing the activity's old text
Added activity to display track details
Track detail view scrolls tags if they don't fit

- removed unused Settings buttons
- removed progress dialogs
- ActionBar 'up' button works
Clean up pull request
Missed a spot
Merge pull request #4 from patrick-conley/260-manually-add-several-tracks

260 manually add several tracks