Merge tag '0.2.1.0' into develop

Removed ByteString Builder to work with bytestrying 0.9, added dependency requirements
Bump version number ot 0.2.1.0 before uploading to hackage
Add 'override' keyword to generated method heads
Add option for using either long or short guard in #ifndef
Increment language-slice dependency and bump version number
Merge branch 'release/0.2.2.0'