Closes #1657

Closes #1533

Closes #1494

Closes #1529

Also prevent Object.prototype properties like toString from
being interpreted as keywords.

Closes #1495

The state.tokenize property could return an array, but the token
method didn't count on that.

Closes #1326

Tests are now specified in a less redundant format, and should be
easier to read and write.

Issue #1026

Closes #1026

This basically matches the CSS3 spec (except it doesn't match non-ascii characters).

- Added link to tests on mode page
- More consistent naming with CSS spec (some of the previous var naming was completely incorrect/misleading)
- Improved highlighting
  - Match vendor prefixes
  - Check for known properties and values (known properties are bold, unknown are not)
  - Added highlighting for media queries
- Cleaner stacking of state

Closes #737

Since v2 is the canonical CodeMirror at this point

So that I can put other doc-related stuff there without polluting the
root dir.

It's tiny anyway, no need to force people to include yet another file.

This normalizes the classes used by most of the modes
(reStructuredText and diff didn't fit in), and makes them all
reference a central style sheet (under theme/). It also adds a theme
option that can be set to change the theme, and defines a few
different themes (some based on old mode colors).