Text objects for mustache and handlebars

Hey guys,
I've made text objects for mustache and handlebars. I've also made help section that describes the new functionlity:

### Text objects

Vim has a very powerful concept of "text objects". If you aren't using text objects,
you can get familiar with it on [this vim help
link](http://vimdoc.sourceforge.net/htmldoc/motion.html#text-objects). Learning
text objecs really speeds up the workflow with vim.

In that spirit, this plugin defines 2 text objects:
 - `ie` a mnemonic for `inside element`, selects all the text inside the
   mustache tag.
   For example, when used with `viw` it will visually select the
   bold text in the following snippets: {{**some_variable**}},
   {{{**different_variable**}}}.
 - `ae` a mnemonic for `around element`, selects the whole mustache tag,
   including the curly braces.
   Example, `vaw` visually selects the bold text in the following
   snippets: **{{some_variable}}** or **{{{another_variable}}}**.

Here are other usage examples:
 - `daw` - deletes the whole mustache tag, including the curly braces
 - `diw` - deletes **inside* the mustache tag, leaving only curly braces
 - `yaw` - "yanks" the whole mustache tag - with curly braces
 - `ciw` - deletes **inside** the mustache tag and goes in insert mode


Please let me know what you think? Is it working well?