Updated documentation
Removed dependency on `free`

The `FreeT` functionality is split off into the `pipes-group` package
Merge branch 'master' into nonfree2

Conflicts:
	src/Pipes/Parse.hs
Merge branch 'master' into nonfree2
Merge branch 'master' into nonfree2

Conflicts:
	src/Pipes/Parse/Tutorial.hs
Updated documentation
Merge branch 'master' into nonfree2
Updated documentation
Added `liftIO` re-export
Revert "Added `liftIO` re-export"

This reverts commit 31fc1eb935c8532b70a141db60a1945f44b5db97.