Update layout preferences entry to explain how to use application layout
Renamed tutorial pages to be more descriptive

NOTE: This will require some redirects to preserve existing link juice
Flatten user guide output into single directory (WIP)
[testing guide] Use correct line for factories
Add Spree's Release Policy to Contributing guide
[migration tutorial] Use name and presentation keys in Spree::Property example

Fixes #120
Spree i18n namespace and ruby styling.

- Clean up some whitespace, render partial the slim way and missing
Spree i18n namespace.

Fixes #121
Add TOC to active sidebar menu
Update wording on release policy as per our internal discussion
Hide border when section TOC is closed
Fix wrong icons on API and Integrator sidebar
Add display_price to the products response
Fix extension links ~> extension_tutoral
Add mention of Ruby 1.9.3 in Heroku guide
Include *_url responses in image resource
Add mention of Ruby 1.9.3 in Heroku guide
Add admin role creation to Heroku guide
Fix issue with api/integrator sidebar menus always stay collapsed
Add display_item_total to return result for orders
Spelling mistake

Here we are changing a preference to something [other then] the default as specified in Spree::AppConfiguration.

"other then " -> "other than"

When working with [Taxomonies] there are two keys terms to understand:

[Taxomonies] -> Taxonomies