Fixed Tanglekit TKIf andTKSwitch classes' element display behavior

When TKIf and TKSwitch would hide and show elements, they put the 'display: none' property on them but reverted to 'display: inline' regardless of what the element was.

Now it just removes the element style property so that the element reverts to its natural display state rather than being forced into 'inline'
TangleKit:  TKIf and TKSwitch work both both inline and block elements (thanks Mert Torun)
TangleKit AdjustableNumber help attribute

There is now a data-help attribute on TKAdjustableNumber used to change the text that appears above the value on hover.
made TKAdjustableNumber help text visible during dragging
CSS for TKAdjustableNumber help text on down state
Merge branch 'master' into tanglekit_element_display

Conflicts:
	TangleKit/TangleKit.js
Merge pull request #1 from edgerunner/tanglekit_element_display

Tanglekit element display