Make xrono work as an engine

This doesn't necessarily mean it's ready to use as an engine yet, but now it
loads as one and has an engine railtie
Further changes to get to a working engine
Removed application helper (moved it previously)
Trying to get combustion working.  Close, but tests still won't run.
fixed a problem where acl9 files weren't getting loaded correctly
tests now run
cleaned up spec helper
changes things in the combustion app to make it work
cucumber runs at least now
fixed a deprecation warning
all tests pass now
modified travis.yml file for the new setup
more travis.yml changes
hopefully fixed travis
another try at travis
fixed rakefile for travis
removed devise specific schema additions to migrations and converted them to normal rails syntax
added some things to travis yml to help with postgres and jrubies
removed pry to hopefully fix jruby
added ruby 2 to travis