Drop the deprecated constants in SwatFormField

This bumps the minor version of Swat as well, because it breaks backwards compatibility.

All sites have already been updated, and other packages will be cleaned up, and require this new version of Swat.
Merge pull request #39 from isaacgrant/drop-deprecated-constants

Drop the deprecated constants in SwatFormField
prepare for release of 2.2.1 | package party