Doc: existing Rails app + RefineryPatch

Refinery::AdminController is no longer agnostic to RefineryPatch.
Revert "Revert "CI against Ruby 2.0.0-preview1 to help out Ruby :)""

This reverts commit 2bc1ff3a7b5f17e7484eef1994fcc5ce4e7c5a2a.
Update doc/guides/2 - Refinery Basics/1 - Changing Page Parts.textile

Updated to add sentence about how to see the new page part. When going through the guide I was confused about not seeing the existing pages have the new part.
Travis is responding to 2.0 for Ruby-2.0.0-preview1
Remove redundant code.
Fixed closing ruby tag on the alternative config code
One step closer to decouple from Rails.
Refactor Refinery::Page#url and friends.

* Add replacement message to deprecated Refinery::Page#url_marketable method.
removed unused store_current_location! method
Removed store_current_location! related code completely.

Not a needed feature and it removes overhead.
Haven't cleaned whitespace in a while.
Add note to changelog about #2029, #2031, #2032 and #2035.
Manually specify cancel_url in page form.

This fixes issue #2044.
Remove Refinery::Page#different_frontend_locale?.

Since Refinery::Page#url was refactored #different_frontend_locale? is
just a leftover and is redundant now.
Merge remote-tracking branch 'origin/issue_2044'
Cleaned up the .htaccess code

The .htaccess code is screwed up on the website. This should fix it, assuming the textile bc markup is respected.

Fixes #2048
Seo translations gets managed by SeoMeta gem.
Update seo_meta to 1.4.0
- deprecated meta keywords
Remove everything that was related to meta_keywords.

seo_meta gem droped meta_keywords support in version 1.4.0.
Add note to changelog about meta_keywords removal.