Merge pull request #25 from aavogt/master

Don't supply base fixities when UInfixE is available.
Bump upper bound of th-orphans
Merge pull request #26 from mgsloan/master

Bump upper bound of th-orphans
0.6.0.5
HSE 1.15 + more toExp cases covered
Another explicit failure case
0.6.0.6
0.6.0.7 (copied from hackage -- bmillwood's has no commit for this)
preliminary implementation for #9 as a prepass