Refactored tooltip module

Removed the unnessasary mixin. Used data-effect-tooltip-type to define
the type of the tooltip. Used data-effect-tooltip-position to define
the position.  Added variables for the tooltip.
Merge pull request #154 from WellingGuzman/gh-pages

use 'this' instead of objects name on JavaScript
Merge pull request #157 from FWeinb/refactored-tooltips

Refactored tooltip module
new tooltip implementation
remove useless variable