Addition of Spec Tests and Some Refactoring of VCs

* Adds RUBYMOTION_ENV to AppDelegate.

* Changes “ to ‘ for strings where no string interpolation is involved.

* Changes square1_attachment_view to sq1_attachment_image_view in
AttachmentsView.

* Changes sequence of width and height arguments for
UIImageView.alloc.initWithFrame in AttachmentsView.

* Adds a placeholder VC for CollisionsGravitySpringViewController.

* Reformats DecorationView

* Changes title of ExamplesTableController and adds
CollisionsGravitySpringViewController item to data array.

* Changes specs from use of @subject to the use of tests <controller>
method.

* Makes refactoring changes to some test it statement strings.

* Adds test for DecorationView local observers via
attachments_view_controller_spec.rb spec

* Adds tests to for DecorationView - these are commented out to to a
crash issue this MacBacon.

* ExamplesTableController spec checks for existence of all example VCs
by instantiating each of them.

* Application windows size fails due to windows not being released by
each spec file - see Testing issue.

* Adds a helper spec to test for instances of example VCs.
Renamed main_spec

See previous commit message for details of this push request.
Merge pull request #20 from dennismajor1/tests

Tests - merging additional spec tests.