Added text about contributions.
Check for illegal base64. Fixes #481
Slightly smarter handling of file browsing
Work-around for Jelly-bean bug
Better feedback when a book can't be opened.
Bounds checking. Fixes #482
Now also uses ZipFile for resourceLoading. Fixes #466
Improvements to filtering. Fixes #486 and #431
Let the dialog swallow key events to prevent beeps
Implemented action-mode for clicking on highlights.
Add bookmark icons
Add fragment for adding bookmarks

The logic for actually adding bookmarks is not yet present, but I'll get
to that
Add menu item for adding bookmarks
Provide the page number to the add bookmark dialog
Accept index/position instead of page number
bookmarks: Create "Add" button for bookmarks
Start on bookmark helper
bookmarks: Hook add button up to events
Indentation fixes
bookmarks: Pass filename to AddBookmarkFragment