return mustache object from factory

First shot at getting greenkeeper to ignoring eslint updates landed with commit 85fa743258.

Sadly that commit had a minor `greenkeper` misspelling in package.json, which obviously didn't have much effect for greenkeeper.
This commit fixes that blooper in hopes that greenkeeper will stop opening PRs about new eslint versions, as we don't want to
update at the moment cause eslint 3.x requires Node.js v4.x.

As zuul consequently fails when running on node v0.12.

https://greenkeeper.io/

https://greenkeeper.io/

As we don't plan to update to Node.js v4 any time soon,
we can't update eslint cause it requires Node.js => v4.

When using amdclean to create a footprint less javascript file, the object needs to be returned to let it properly be assigned to the created script variable.

Documents ways to set custom delimiters via JS, in addition to inline in the templates.

* 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 🚀