Leapmotion plugin

Made sure all vars are declared with the var keyword.
	modified:   plugin/leap/leap.js

Commented out leap plugin inclusion.

modified:   plugin/leap/leap.js

Enhanced the pointer.
Cleaned up the code.
Added additional optional parameters.
Updated documentation.

modified:   README.md
modified:   index.html
modified:   plugin/leap/leap.js

Updated README.md to mention the leap plugin.
Removed leap settings from index.html.
Better variable naming in leap.js

modified:   README.md
modified:   index.html
modified:   plugin/leap/leap.js

modified:   css/reveal.min.css
modified:   plugin/leap/leap.js

Occasionally gestures were fired twice. This helps prevent that.
modified:   plugin/leap/leap.js

modified:   css/reveal.css
modified:   css/reveal.min.css
modified:   plugin/leap/leap.js

When used correctly, the 1/2 second delay is uncessary and may yield undesireable results.
modified:   plugin/leap/leap.js

Changed invert to naturalSwipe
Removed invert rule from index.html
Ensured that left/right swipes only work with 1 hand present
modified:   index.html
modified:   plugin/leap/leap.js

Added timing code to limit gesture calls.
Added gesture to access the overview.
index.html includes the leap plugin

Left, right, up, and down gestures.
Optional invert for gestures.

Updated README.md

Added "touch" config property

For backward-compatibility, add a new 'fragments' property to the
fragmentshown and fragmenthidden events. The 'fragment' property still
returns the first fragment.