Ignore npm log (and any other logs that may arise)
Unify indentation to 2 spaces.
Merge branch 'tabs-to-spaces'
Add build instructions to README
Add Guardfile, document dev instructions in README

This will let devs automatically rebuild viewer.js
and stuff it in examples/js.

Also tell people what they need to get started
Merge branch 'add_guardfile'
Merge branch 'master' into add-colorbrewer-schemes
Add three possible color schemes

I think "intense red-blue" is probably best for
this application.
Merge branch 'add-colorbrewer-schemes'