Add missing operators
Move `Infinity` to `jsNumber` (from `jsType`)
Link `jsNan` to `Number`

- Paradoxically, `typeof NaN` returns `number`
Move program keywords above comments

- Otherwise, `jsOperator` trumps `jsComment` and `jsLineComment`
Merge pull request #90 from qstrahl/develop

Fixes issues raised by 03e0f24