* Fixes CLI tests for windows

* Hijacked exec so we don't have to wrap each command in changeForOS, and made replacing 'cat' safer with word boundaries

* Fixing changed tests to be more consistent with the code base

Assert null lookup when rendering an unescaped value

eslint@2.5.0 breaks build 🚨

http://greenkeeper.io/

It was not being asserted anywhere else, and I was suspecting that
PR #552 was changing current (and correct) behaviour.

Either vim or git was going crazy with the indentation when I tried
improving the test via changing one of the lines, so I linted it all
together.

Document the API

I couldn’t find the API in the docs. This is what I found out by reading the source. Let’s save others the pain.

Mark partials as optional

Update eslint to version 2.2.0 🚀

http://greenkeeper.io/

Cosmetic changes to Readme

Add syntax highlighting style to previously missed code blocks

Add optional `output` argument to mustache bin

Fix minor typo in docs

Fix inconsistency in defining global mustache object.

Improve HTML escaping

This closes a couple of potential exploit scenarios.
Backtick (`) for older IEs and equals (=) for unquoted attributes.

Refs 83b8e846a3
Closes https://github.com/janl/mustache.js/pull/388

Removed html syntax highlighting on README.md example

Unpin chai and eslint versions

greenkeeper.io will let us know if the minor/patch bumps break our code, so go wild.

Remove IE8 from zuul test runs

Extremely minor documentation update

Update zuul to version 3.7.0 🚀

http://greenkeeper.io/

Update eslint to version 1.7.3 🚀

http://greenkeeper.io/

Update chai to version 3.4.0 🚀

http://greenkeeper.io/

fix indent error in switch-case statement

Update eslint to version 1.7.2 🚀

http://greenkeeper.io/

Update README.md with proper grammar

Past tense of "run" is "ran", not "runned".

Update eslint to version 1.7.1 🚀

Update my username :)

http://greenkeeper.io/

Update eslint to version 1.7.0 🚀

http://greenkeeper.io/

I'm sorry. :see_no_evil: