Alternate names for builtins.

It is now possible to refer to each builtin functions as MIST.name in
addition to just name.  For example, MIST.wsum is another name for wsum.
Don't use ugly code.
Add optional prefix to MIST.parse.
Allow mist.js to serve as as server-side module.
Add ability for animator to open as jpeg.
Add capabililty to generate jpg and png.
Merge branch 'master' of github.com:GlimmerLabs/MathOverImages
Update package.json

* Fix Sam's name.
* Add Daniel as developer.
* Add more requirements.