- Adjusting indent of pasted block to current line
- Handle multi-line case, subsequent lines have their indent adjusted by their offset
to the first line.
- Add two tests for ]p to demonstrate this.
- Add [p to indent paste above

Added django.js which implements the following modes

  - django (text/x-django)
  - django:inner

Issue #988

Issue #2382

Issue #2360

Issue #2385

Conflicts:
	AUTHORS
	doc/compress.html
	doc/manual.html
	index.html
	lib/codemirror.js
	package.json

Issue #2355

Closes #2348

(It wasn't working in the first place.)

Summary: If `options.async` is enabled, it's possible for `activity` to
be called a second time before the first call's paired `finishUpdate` is
triggered. Then, when the second call to `finishUpdate` happens, the
still-active widget in `completion.widget` is unceremoneously
overwritten and can now never be closed. This leads to a lot of weird
and broken behavior, notably an autocomplete window in the browser that
never goes away and can insert its text over and over and over.

Test Plan: This is really hard to trigger. My project consists of a
webworker providing autocomplete, which has some latency before it calls
the `finishUpdate` callback. But it depends on the exact latency and
even the user's typing speed to whether things happen in just the right
order. I basically just added and deleted characters with the
autocomplete prompt open a bunch until it eventually reproduced. After
applying this patch, several minutes of bashing didn't trigger the issue
again.

Issue #2390

Issue #2390