Improving message when notifications is empty

I give a nem to paragraph and extend some classes in CSS.
In JavaScript I just control the insertion of .active class in this
element.
decreasing margin-top of boxes after titles.
Changing some example code.
Changing to SMALL the ls-help-message example

Tag small looks better and right than paragraph
ignoring gemfile.lock
Fixing after with clearfix in title of ls-area-account
Adding some space in code box in documentation.
Adding some description to popover.
fixing link of abas in menu of components
Merge pull request #799 from diegoeis/reboot

Little fixes on example code.