Add flag descriptions
Merge pull request #21 from alexander-b/master

Add flag descriptions
Removed trailing whitespace
Merge branch 'master' of github.com:ekmett/tables
update for compatibility with current lens 4's simplified Contains
version bump to go with the official lens release
Update for GHC 7.8 and bump version to 0.4.1

This is backwards compatible with GHC 7.6.