Depend on jasmine-rails instead of jasmine

Let jasmine-rails do what it does, let Jax focus on WebGL

This closes #72.
make `rake jasmine` (mostly) work with new jasmine
ren application.js to jax.js so dev server doesn't complain
consolidate erb, remove superfluous erb processing
Revert "ren application.js to jax.js so dev server doesn't complain"

This reverts commit b1265122ce8a85ea68068f3ae29115f66dea28bb.
fix init