Asset pipeline fix for ajax spinner image.
Fix time and date format in time_ago_in_words and time_ago_in_words_or_date helpers.
Make headers consistent in header.
Add ads section to readme.
Add syntax highlighting in readme.
Formatting changes to readme.
Fix travis badge for rails4 branch and change format to svg in readme.
Add missing periods to readme.
Merge pull request #209 from t-bullock/update-readme-rails4

Update readme on rails4
Merge pull request #207 from t-bullock/time-ago-format-fix

Fix time and date format in time_ago_in_words
Merge pull request #206 from t-bullock/spinner-fix

Asset pipeline fix for ajax spinner image.