Allow hspec 1.6
Merge pull request #17 from snoyberg/master

hspec 1.6
Bump version to 1.2.2.1.
Merge pull request #16 from bogiebro/master

Insert select statements
Final touchs on docs.
Bump version to 1.2.3.
common math and aggregation functions
Merge branch 'master' of git://github.com/meteficha/esqueleto