Use  type variable also in Font-Family name.

Currently all variants of the font get the same name "Roboto" that makes no sense.
Merge remote-tracking branch 'mficzel/patch-1' into feature/issue-11
Add every flavor of Roboto as Roboto-{flavor}, too

Close #11
Merge branch 'feature/issue-11' into develop
Bump version
Merge branch 'release/0.2.7'
Merge tag 'v0.2.7' into develop

Version 0.2.7