Closes #325

This is to allow people to implement pseudo-ctrl/alt keys in mobile
settings.

During the handling of a key event, API calls that change the editor
content are simply ignored. This may have unexpected effects in key
handlers that perform composite operations.

f = @ and f = fun(@) would not highlight properly
  i changed @property to highlight seperatly as @ property
  which i think makes more sense because its a shorthand for
  this.property and this and property have different colors

Closes #301

Issue #297

Closes #308

It'll be called with the current instance as argument, and should
*always* return a string that refers to a keymap.

Experimental feature, not documented yet.

This isn't really correct, but covers most cases. Someone with more
knowledge of Ruby's syntax will have to chime in what the real
solution would look like.

Issue #314

The second parameter of `onChange` is not `{from, to, newText, next}` but
`{from, to, text, next}`.

I also went on and improved the explanation of what onChange does.

Signed-off-by: Thaddee Tyl <thaddee.tyl@gmail.com>

by Soumen Basak

$ is a valid identifire
/path no longer breaks
0...1 no does not highlight as 0. .. 1
removed some spaces on blank lines

Courtesy of Soumen Basak

Courtesy of Soumen Basak

Closes #311

This one handles indentation.

Courtesy of Peter Kroon

Closes #306

Changes demo html page to fit in with other mode demos, link from
project page and compression helper.