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
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