webglapp: active node uses icosphere (far less triangles).
webglapp.js: fix errors when coloring by user or reviewer.
Refactored neuronstagingarea.js

* more batch-oriented tasks
* removed cruft

Set the stage for further changes.
neuronstagingarea.js: larger color seeds, an fixed a mild issue with pickColor
neuronstagingarea.js: replace tabs by spaces.
neuronstagingarea.js: use the requestQueue for loading skeletons,
which provides a waiting spinning wheel icon and plays nicer
with the rest of the application.
webglapp: cannot share meshes across renderer instances.
webglapp.js: fix incorrect destroy method definition for View.
WindowMaker: load skeletons from selection table when opening 3d view.
Refactored neuronstagingarea.js

Major effect: reduce memory footprint and loading time dramatically.

* create instances of Rapahel color wheel on the fly when needed. These
are very memory-heavy and take considerable time to create, noticeable
when adding hundreds of skeletons to the Selection Table.
* paginate Selection Table: only 20 skeletons listed maximum per page.
* renamed numerous methods for both conciseness and clarity of purpose
* Renamed "Properties" button to "P", for space
* Shorter neuron name by shortening the appened (Skeleton: ...) to #...
* Added an 'x' to remove all skeletons, with a confirmation dialog.
* Background color of selected skeleton is light green rather than yellow.
The light green matches the color of the active node in the canvas and
the 3d view.
neuronstagingarea: turn an alert into a growlAlert.
webglapp: fix error setting material of cylinders and node spheres.
Also renamed an argument of createLabelSphere for consistency.
webglapp.js: remove superfluous call to render()
neuronstagingarea.js: fix GUI reporting of number of selected skeletons
and improve the logic for showing the growlAlert when attempting to add
the active skeleton upon launching the Selection Table widget.
No longer intercepting command-key events on Mac.
Merge branch 'master' of https://github.com/acardona/CATMAID
Merge remote-tracking branch 'upstream/master'