added validation to username attr to disallow spaces and created a method that cleans up whitespace on either side of username
merge error
refactor infinite scroll to reload previously viewed posts that are removed from the top of the view when new posts are loaded into the view
tweak responsive grid
merge master into shawn, user.rb modified
add scroll-up and down infinite scroll from master
add new post button, add in loading spinner
minor improvements, add navbar hide upon scroll-down
spiff up posts styling, add vendor prefixes