switch to using postgres in dev and test
make crop search case insensitive
Remove travis environment

We had this special environment because we wanted travis to be different
to our test environment -- specifically, to use postgres, while we used
sqlite in dev/test.  We now use postgres in dev/test so this is no
longer necessary.
looks like we needed that postgres creation line after all
trying to revert to the simplest travis config
don't install production gems in test
One more try to get travis working with postgres
install pg in all environments
Merge pull request #365 from Skud/case-insensitive-search

Case insensitive search