Rename Grunt build tasks for clarity

[mkremins]

Right now we use the grunt deploy command to build the Ensemble library and the grunt build command to build the authoring tool (which doesn't correctly build the Windows version of the tool, as per #95). It's easy to get these confused, and we should probably rename these tasks to something clearer. Maybe grunt buildLibrary and grunt buildTool?

There's probably other Grunt build commands that could also benefit from renaming. Maybe the one that generates the documentation (grunt document – this one might be fine as is) and the one that does all of the other build commands in sequence (grunt techRelease)?