Update build for release

Merge pull request #62 from natefaubion/pop

Add pop functions

Merge pull request #61 from purescript/0.8-updates

Updates for PureScript 0.8

Merge pull request #60 from natefaubion/perf-0.7.6

Performance improvements for 0.7.6

Revert "Better pattern sharing for perf."

This reverts commit ebf42f7.

Merge pull request #59 from natefaubion/perf

Performance improvements

Merge pull request #42 from LiamGoodacre/master

Couple new foldable functions to `Data.Map`

Fix shadowed type variable warnings

Merge pull request #50 from aspidites/fix-warnings

Changed a type  variable in an attempt to quelch shadow warnings.

Merge pull request #49 from bagl/issue#40

Get rid of compiler warnings