Grammar
Merge pull request #48 from sleepynate/patch-1

Grammar
remove Lens from progress in README
Merge branch 'master' of github.com:NICTA/course
Tests for toList and fromList
Merge branch 'master' of github.com:NICTA/course
Tests for moveLeftN'
Merge branch 'master' of github.com:NICTA/course
Tests for moveLeftN'
Merge branch 'master' of github.com:NICTA/course
tests for toList
fix ListZipper#index
fix ListZipper#index
fix ListZipper start and end
fix tip
Add ParseResult data type. Issue #51
fix show for ParseError. Issue #51
convenience function for satisfy
Merge branch 'master' of github.com:NICTA/course
fix up for Issue #51