Remvoe deferred_garbage_collection

fixes #279
Update Gemfile so that I'm able to install things on a brand new system

Fixes GH-314
Abort application generation in case problems are detected when installing gems
Merge pull request #315 from Helabs/fr-update-gemfile-for-GH-314

Update Gemfile so that I'm able to install things on a brand new system
Add how to test on CONTRIBUTING file
Remove extra rspec definition from gemfile

Closes GH-303
added sendgrid setup
Merge pull request #301 from Helabs/feature/full-setup-sendgrid

added sendgrid setup
Remove import _variables.scss from responsive.scss.
Remove import _variables.scss from general.scss.
Remove import _variables.scss from form.scss.
Add import _variables.scss to application.scss.
Update changelog.
Merge pull request #313 from Helabs/tm-variables-scss

Import _variables.scss only once.
Merge pull request #316 from Helabs/fr-abort-on-gems-errors

Abort application generation in case problems are detected when installing gems
Merge pull request #306 from Helabs/remove-deferred_garbage_collection

Remove deferred_garbage_collection
Merge branch 'master' into tm-racktimeout-config
Revert "Add  on , to configure rack-timeout into application middleware."

This reverts commit f0c1e468527a3091d85c299de482918738dfa7b9.
Update Gemfile to use rack-timeout from github.
Update changelog on rack-timeout setup.