Various import cleanups
Cleanup warnings in Bill.java
- use Calendar instead of Date to get the year to silence a deprecation
  warning
- add Locale.US to a toLowerCase().  I think that's a decently safe locale for now
More warnings cleanups
Silence deprecation warnings with the BitmapDrawable constructor
Merge pull request #619 from smpeters/master

Various warnings cleanups
Update README.md
Update README.md
merging