add content_for :main_content to application layout, add two_column layout with specific content_for :left_sidebar and :left_sidebar_top
adjust page views to match new layout templates, add content_for left_sidebar and left_sidebar_top where necessary, as well as new two_column_layout method which renders the layout and necessary instance vars
move discover view from hashtags to tweets as per twitters new layout
styling for two_column_layout views
add validations for new two part user edit form (general profile changes, and account changes), abstract jquery validate alphanumeric validation to its own file