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Merge pull request #7 from akzhan/patch-1

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Add has_one through
Add rename column to migrations (recol)
use start_expr for form_for and form_tag helpers (Fixes erb problem)
Change scope to use lambda and where
Add sope with arguments snippet [scar]
Fix stylesheet_link_tag, make it work with haml
Enable javascript_include_tag for haml
Merge branch 'master' into gh-pages
Update the cheatsheet