Closes #3538

Issue #3518

Right now if you have a selection, and you enter a bracket/quote,
surrounds it with quotation marks, and selects the entire quote. This
change should change the behaviour to selecting the interior of the
quote instead.

The motivating example for me was autocomplete, where after
autocompleting a function the arguments are selected, so if you want
to insert a string literal right now you have to delete the selection
before you can enter the quotes. With the proposed fix, it'll be
rather more fluid.

Issue #3431

Issue #3431

Issue #3431

Issue #3487

Closes #3456

- Provide custom list through CodeMirror hintOptions to kickoff
  autocompletion for domain specific usage.

Since the library is completely oblivious to module loaders

Issue #3447

Issue #3438

Issue #3423

Adding a CodeMirror option for controlling how long the ternTooltip should be visible before closing

... and export (via defineExtension) a method to explicitly trigger
linting from user code.

Closes #3409

See http://discuss.codemirror.net/t/tern-webworker-causing-hint-flickering/300

Issue #3337

Issue #3337
Issue #3338

Tern completion for required module returns name (module wuith quote)
and displayName (module without quote). This PR gives the capability
to display completion for required module without quote.

I noticed that the image that accompanies auto-completion suggestions
when the tern addon is active gets cut slightly, because the default
line height is slightly smaller than the image height.

This change above ensures that the line height is bigger, hence
ensuring that the image is fully shown.

See http://discuss.codemirror.net/t/tern-special-characters-causing-issues/294

This PR initialize docs before creating tern server instance, because
in some case, tern server creation call getFile which use docs.

I have this case by using requirejs tern plugin + custom plugin which
defines modules :

```json
{
    "!name": "delite",
    "!define": {
      "!requirejs": {
        "delite/register": {
          "!type": "fn(tag: string, superclasses: [], props: ?) -> fn()",
      }
    }
  }
```

Issue #3308