Merge tag 'v1.0.0'

Merge remote-tracking branch 'upstream/master'

Merge pull request purescript-deprecated#9 from hdgarrood/unsafe-perform

Add unsafePerformEff

Merge pull request purescript-deprecated#7 from jbrownson/master

make type Pure use an empty row instead of rank-2 types

Merge pull request purescript-deprecated#3 from purescript/class

Move MonadEff over

Merge pull request purescript-deprecated#3 from purescript/class

Move MonadEff over

Updates for RC