Functionality and error messages match the latest vim 7.0 release.

- handling special keys better for commands requiring a character
- r can operate on selection
- fixed: t moves back if character not found
- +/-/_ via extension of moveByLines motion

- gj/gk for moveByDisplayLines motion, allows vertical movement within
wrapped lines
- :noh[lsearch] is now an ex-command
- new ex-commands can be defined through api, using
CodeMirror.Vim.defineEx()
- :{number} should now move to line with {number} on the gutter
- parseKeyString now also accepts keys like <Space> (in addition to
<C-{Key}>)

When the matching symbol of a closing bracket is on a different
line, it will match to the incorrect opening bracket. For example,
go to http://codemirror.net/demo/vim.html and place the cursor on
the closing brace at line 11 and press '%'.  It will incorrectly
match the opening brace on line 4 instead of the brace on line 8.
This patch fixes that by starting the line search at the *end* of
the line when searching backwards.

 - Move a lot of methods from the CodeMirror to the Doc prototype
 - Allow getting, attaching, and copying of Doc objects
 - Add linkedDoc to create documents that stay in sync
 - Allow such linked docs to be sub-view on their parent
 - Rewrite history handling
 - Remove the concept of a view

Documentation still failing.

For cheaply adding extra styling without going over
the whole document and doing markText.

Issue #1069

* and # will fall back to non-blank characters if no keyword is found.

Issue #1065

- Fix bug where visual mode cannot be entered from EOL.
- When already in characterwise visual mode, pressing Shift-V now enters linewise visual mode instead of exiting visual mode.
- Mouse selection in normal mode enables visual mode.

`markText` changed parameters from v2 to v3

Various other style fixes. Updates to comments.

    Use newlineAndIndentContinueComment by default, falling back to newlineAndIndent if the former command is not defined.
    Same behavior is made default for Enter key in insert mode.