Quote strings in Show instances (purescript#86)

Merge pull request purescript#83 from purescript/string-gen-size

Ensure `genString` always generates at least one character

Merge pull request purescript#82 from purescript/more-gen

Enhance string & char generation

Merge pull request purescript#77 from purescript/gen

Add some generator functions

Merge pull request purescript#76 from purescript/ps-0.11

Update for PureScript 0.11

Merge pull request purescript#70 from leighman/master

Update documentation - split now takes a Pattern

Merge pull request purescript#68 from Risto-Stevcev/master

Rewrote null check to use mempty

Merge pull request purescript#66 from purescript/bump

Prepare for 2.0 release