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Merge pull request #114 from tovodeverett/fix_noncaseable_case_insensitive_indexes

Fix creation of case insensitive indexes with non-caseable columns
Merge branch 'master' of github.com:lomba/schema_plus
support rbenv in addition to rvm
get simplecov to properly merge results of runspecs runs
less verbose rspec output
properly output PRAGMA FOREIGN_KEYS = ON

(sqlite3 claims to require this, but it seemed to be working anyway?)
Merge branch 'master' into rails4
exclude mysql gem when rails 4
don't need `remove_method :indexes` for Rails 4.

(it *does* really seem to be needed for Rails < 4 -- i tried taking it out and a whole bunch of specs failed.  i didn't spend time trying to understand it, just put it back and left the working things alone.)