add mobile poster image feature for video and background_video pages
Merge pull request #143 from schoetty/mobile_poster

add mobile poster image feature for video and background_video pages
Move spec support files into config and helpers directory

`config` contains configuration of testing libraries. `helpers`
contains doubles and modules mixed into example groups.
Run specs against generated rails app

Add `pageflow-support` gemspec to be used by Pageflow extension
gems. Use `Pageflow::Dummy` to generate dummy test application of
different Rails versions.
Remove dummy app
Use Instafail RSpec formatter
Fix factory girl deprecation warning.

`ignore` is now `transient`.
Fix RSpec version

Tackle deprecation warning generated by 2.99 for update to 3.0 later.
Skip schema:load in travis build
Ignore missing db on db:drop
Improve Facebook Open Graph Meta Tags

* Use `og:image` instead of `og:image:url`
* Change `og:type` to `"website"`
Merge pull request #157 from tf/fb-meta-tags

Improve Facebook Open Graph Meta Tags
update changelog
Rails 4.1 Compatibility

* Use `safe_join` to concat page tempalte strings
* Change placeholder interpolation to return unresolved asset path.
Merge pull request #161 from tf/rails-4-1-compat

Rails 4.1 Compatibility
Merge pull request #162 from tf/support-gem

Generate Dummy App for Test Suite
Extract pageflow.ui from editor.

Backbone views and templates for reuse in Backbone apps other than the
pageflow editor.
Update template paths
Merge pull request #163 from tf/extract-ui

Extract Common Backbone Views from Editor
Add fileSelectionHandlerOptions option to FileInputView

Allow supplying further options to be passed in the payload to allow
the file selection handler to determine its referer dynamically.