refactored search into the header bar.
Added search information widget, needs to fleshed out.
added search information, and changed the navigation to be located on the app-icon and the search-icon.
Merge pull request #82 from Kitware/search-refactor

Search refactor
Fixed bug in clamping where interior control points weren't respaced.
Style fix in rendering widget, optimization to viz canvas widget.

Set min width of field name dropdown so that it lines up with the
left edge of the current value text box and color box.  Also set
the lookup table for a field code in the callback of the vis canvas
widget light so that we do not have to create them with every call
to draw a frame.
Style cleanup to please jshint
Merge branch 'master' into unified-per-field-coloring-and-lighting
Fixes for lighting based problems arising when testing workbench.