@tomduckering - adding a fix for the bug in the pessimistic constraint fixing for RPMs converted from Gems.
Fixes pessimistic constraint conversion

See jordansissel/fpm#693
Merge branch 'master' of https://github.com/jordansissel/fpm
Use rspec 3.0.0

Ran transpec on spec/ directory for automatic and delicious upgrades.

Also removed minitest dependency since fpm doesn't use it.
Fix typo
Merge branch 'pr/693' (from #693 + typo patch fix)