Had obviously been forgotten, but those test files should have been part
of the ordinary lint phase.

The fact that we had forgotten to lint these files, allowed a missing
semi-colon to sneak into `./test/cli-test.js` file.

Refs https://github.com/janl/mustache.js/pull/777

This fixes a small blooper introduced in a3f4339.
Error message thrown for invalid template type, should be equal on
the server and in the browser.

As we require the template to be a `string` we now throw an error when given
any other data type. This should provide the developers with a meaningful
error rather than a cryptic TypeError from the murky depths of our source code.

Fixes #464

Covers the project with browser tests, not only V8 via node/iojs. Tests are runned with [zuul](https://github.com/defunctzombie/zuul) which
provides simple local browser testing, aswell as cloud testing on multiple browsers with [saucelabs](http://saucelabs.com).