"Reason" field should give instant feedback when 140 characters is up

Fixes #37. When there are 40 characters left, a label will show up on
the right of the reason textbox with a countdown of how many characters
remain.
Switch to using the minified version of bootstrap-maxlength
Fixing minor HTML markup issues

Discovered using IE's F12 dev tools.
Replace for loop with .each()
Replace .each() with implicit iteration
Merge pull request #54 from brandonsato/pr/52

Reason field length feedback all tidied up.