Loading the game is too slow

[jimbojw]

Especially on mobile devices, loading this game is slow. Using profiling tools, it's clear that bootstrap includes a bunch of unused styles, and there are too many includes overall.

Need to:

• combine/reduce the number and size of CSS and JavaScript files loaded.
• consider using LESS compilation to build a custom subset of bootstrap CSS.
• consider dropping jQuery (if possible) for a lighter framework - may not be possible due to bootstrap dependency.
• add early loading indicator so users know something is happening while waiting.