Merge pull request #507 from dbabokin/master

Bumping up to 1.4.1 version
Merge pull request #508 from dbabokin/master

Bumping version to 1.4.1dev
Change mask to use __mmask16 instead of a struct.
Merge pull request #509 from jbrodman/master

Change generic-16's knc.h to use __mmask16 instead of a struct.