Merge pull request #3 from Fanael/master

Cleanups and two new checks
Find exact column of package name so whole word gets highlighted
Save excursion while running the checks
Fix for #5 (thanks @Fanael)
Use "0" as the dev version for this package to avoid our own warnings
Make get-well-formed-dependencies annotate each dep with the column it's on

This avoids duplicating flycheck-package--position-of-dependency calls
everywhere. In fact, this function is not necessary anymore.