Merge branch 'release/0.2.0'
Merge branch 'release/0.2.1'
added english numerals bijections
Merge branch 'master' into develop
Added unit tests. Made helper methods private as per Oscar.
convert between various number systems
new guava bijections
fix collections.
docstring.
Merge pull request #72 from twitter/feature/supplier

Add new Guava bijections
add abstract
Merge pull request #73 from twitter/feature/fix_colls

Allow type conversion in scala <-> java bijections
Merge pull request #65 from krishnanraman/develop

added english numerals bijections