cancel tooltip when no text is present
Merge pull request #29 from fabiosantoscode/tooltipNoText

cancel tooltip when no text is present
tooltips cannot leave the left or the top of the screen
tooltips can't go off to the right and bottom
Merge pull request #30 from fabiosantoscode/fixTooltipOffscreen

Fix tooltip offscreen
Merge remote-tracking branch 'sapo/develop' into develop