Fixed alignment between buttons and inputs.

This commit resolve locaweb/locawebstyle#988
Merge pull request #989 from Wylkon/3.0.2

Fixed alignment between buttons and inputs.
adding example of 404 in changlog
Improvement on sidebar when has contain .ls-area-account
Fixed notification bar on mobile, when closes sidebar.
create mixing to rgba
applying mixing rgba
changing event namespace to avoid removing other events
when finding links, item must have a href attar before looking for its content
Adding info about modal in event tracking when sending a form from inside a modal
fix to background-color IE
applying mixing rgba
Creating a function that we can use to convert px to rem.

This improvement prevent the support of old browsers to REM.
When use font-size or any other property of CSS, you put in value the
*remtopx(rem value)*. The example:

p
   font-size: remtopx(1)
—
p
  font-size: 16px
converting all REM value font-size to *remtopx* function.