Merge pull request #1021 from deividmarques/3.1.0

Add documentation texts compatibility with browsers
:+1:
Creating font-size classes
Little fix on documentation.
Merge pull request #1022 from Wylkon/3.1.0

Creating font-size classes
making a new page to explain better how to support old fucking browsers.
Merge pull request #1028 from diegoeis/3.1.0

Moving the explain about old browsers to a new page.
fix to ls-block when form and inside ls-actions-btn