Fix parsing of 'say "$a!"'.
Merge pull request #95 from timo/levenshtein

Use Levenshtein to suggest variables/routines/superclasses
Merge pull request #96 from timo/levenshtein

don't ask "did you mean" for 0 suggested routines.
Merge pull request #98 from timo/levenshtein

More Levenshtein stuff:types in parameters. code cleanups. Self-Inherit error.
Update 6model header and bump NQP_REVISION.

This tracks the REPR API change, and will allow Rakudo to make use of
it (will happen in future commits).
Add missing dependency.
Start using new REPR compose protocol.