Update ActiveMailer, ActiveModel, Cucumber::Rails

Add explicit version constraint
Update FactoryGirl::Rails

Add explicit version constraint
Update DatabaseCleaner

Add explicit version constraint
Update SQLite3

Add explicit version constraint
Update RSpec::Rails (to 2.14.2)

Add explicit version constraint
Update RSpec::Rails (to 2.99.0)

The RSpec specs generated within the Cucumber features depend
on deprecated RSpec methods, e.g. `raise_error(ErrorClass, message)`

Those dependencies are **not** removed here, and therefore RSpec::Rails
should not be updated to its 3.x series. Deprecation warnings provided
by the 2.99.0 version of the gem will however be useful to start
writing unit tests compatible with RSpec 3.

The intention here is to make possible to replace the offending specs
(which are part of the Cucumber features - integration tests) by
independent specs - unit tests. That should lead to a simpler, faster
and more transparent - more usable tests suite.
Keep Aruba version

Add explicit version constraint
Merge branch 'add-explicit-dependencies-versions-constraints'