change Twitter badge from <button> to a#badge
Merge branch 'master' of https://github.com/SU-UComm/bootstrap

# By Scott Stocker
# Via Scott Stocker
* 'master' of https://github.com/SU-UComm/bootstrap:
  fixing some validation issues in header and homepage carousel (hometop).
  move search underneath navbar in mobile/tablet views and adjust layout.