Bump snapshot version.
Add WIP section to README.
Update bcpg version to 1.50.
Test more compression and encryption algorithms.
Remove some dead code.
Integrate with coveralls.io.
Add versioneye badge to README.
Update dependencies.
Change versioneye badge to public link.
Remove some return value type hints.

Motivation is to make it unnecessary to import BC classes in code that
requires this library.
Expand tags tests.
Remove more return-value type hints.
Set patch version 0.5.1
Merge branch 'release-0.5.1'

Conflicts:
	README.md
	project.clj