Change version to specify DB

Need this because it uses RAND() for MySQL and RANDOM() for PG
Remove String from Gemspec version
Update to Refinery 2.1.0

changed gem specs to 2.1.0
Removed call to Refinery.i18n.enabled
Show  use of page decorator
Merge pull request #4 from anitagraham/Add-page_part-

Add page part