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.
fixed DecorationView test spec by replacing \'tests controller\' with @view = DectorationView.alloc.init
Merge pull request #20 from dennismajor1/tests

Tests - merging additional spec tests.
Merge pull request #21 from dennismajor1/decoration_view_tests

Decoration view tests - fixed DecorationView unit tests to correct problem that was causing MacBacon to crash.
Refactored DecorationView to allow additional unit tests.
Merge pull request #22 from dennismajor1/some_refactoring

Refactored DecorationView to allow additional unit tests.
Adds unit tests to DecorationView UIView

Adds a large number of unit tests to DecorationView since it  provides
the main view for a number of the dynamic VCs

Refactors DecorationView to accommodate more unit tests

Protects those attr_accessors that do not provide API access to the
class instance. These attr_accessorscould be replaced by ivars.

Adds a cleanup method for setting spec windoww and controller to nil.
This does not appear to be working as expected - further investigation
required.
Merge pull request #23 from dennismajor1/decoration_view_tests

Adds unit tests to DecorationView UIView