Initial work on the daemon commit (#192).
Add grunt-git, grunt-contrib-copy.
Seperate compile into dev-compile and dist-compile.

dev-compile will build plottable to build/ directory.
dist-compile copies from build/ directory and applies
post-processing (add license header; strip .d.ts files).

Change all local refs to point to build/plottable.js, etc.
Need to get the git commit machinery working next.
Add update-built task