Another registerLoader() implementation
Added tests for first three possible cases using translateProvider.registerLoader()
Fixed copy and paste mistake
Added docs for asynchronous loader definition (string)
Moar documentation on registerLoader()
Added tests for registering loaders with langkey
Some testing
Merge branch 'master' into async-loader-proposal
Restructuring unit tests
Finished restructuring tests
async loading stuff with httpBackend
Merge branch 'master' into canary

Conflicts:
	README.md
	ngTranslate/provider/translate.js
	test/unit/translateSpec.js
Add demo.
Add grunt task `express` to test XHRs.

Start server with `grunt server`
Auto-copy the latest build to demo resources.

For an bleeding edge developing, this auto-copies the final `angular-translate.js` to `demo` directory. That avoids manually editing the demo HTML files.
Support for asynchronous loaders or transformers (basically).

+ Changes all demos
+ Removes completly the old approuch of async loading.

This finally introduces the new `$translateProvider.registerLoader` which automatically can resolve dependencies (via `$injector`), uses promises (via `$q`) and is open for future built-in templates.

`registerLoader` should be *called with an injector-function-argument* -- either a function with dependencies in the argument or with a wrapping array avoiding minimizing issues. The injector-function must return the actual loader function argumented with thr requested `key` only.

```javascript
$translateProvider.registerLoader(function ($http, $q){
        return function (key) {
          ...
        };
});
```

or even

```javascript
$translateProvider.registerLoader(['$http', '$q', function ($http, $q){
        return function (key) {
          ...
        };
}]);
```

The resolving value should be an object structured like (`{key, items}`)
The *return value of the loader function* should be a promise; a `$http`'s promise will be okay if you can garantuee the correct data structure (`{key, items}`).

For sample usage, there are already two simple convenient built-in templates available
1. `registerLoader('lang.php')` which will invoke XHRs for every language switch, i.e. `lang.php?lang=de_DE`
2. `registerLoader({type: 'static-files', prefix: 'lang-', 'suffix: '.json'})` which will invoke XHRs for every language switch, i.e. `lang-de_DE.json`

The demo at `demo/index.html` and `demo/app.js` shows how you have full control about the loader.

related issue #4
Fixed components paths
chore(dependencies): update dependencies

- update grunt-contrib-concat from 0.2.x to 0.3.x
chore(translateProvider): remove pruneTranslations

- remove pruneTranslations since it isn't used
feat(ngmin): add grunt-ngmin

- add grunt-ngmin task to pre-minify code

Closes #20