feat(): add option to html escape all values

Apply an additional functionaly to an interpolator being responsible for escaping interpolated params or using a sanitation service when working with them.

For the default interpolation service, the usage will be:

```javascript
// config
translationProvider.useSanitizedValues(true);
// scope
$scope.user = {link: '/user', name: '<h1>Big User</h1>'};
```

and

```html
<a href="{user.link}">{user.name}</a>
```

will results into the html

```html
<a href="/user">&lt;h1&gt;Big User&lt;/h1&gt;</a>
```
Merge branch 'canary' into feature/xss-protection

Conflicts:
	src/service/translate.js
docs(guide/ru): Use $translateChangeSuccess event with $translate service
feat(): add option to html escape all values

In addition to fe94c1f the internal structure of escaping was replaced with a strategy pattern. That allows different kinds of sanitizing including standard html escaping.
docs(guide/uk): Use $translateChangeSuccess event with $translate service
Merge pull request #240 from DWand/cyr-translations-support

Ru/uk translations support (Use $translate successEvent with $translate service)
add English documentation for multiple fallback languages
add German translation for multiple fallback languages
docs(guide/ru): Shortcuts and links
docs(guide/uk): Shortcuts and links
Merge pull request #241 from DWand/cyr-translation-support-shortcuts

Ru/Uk translations support: Shortcuts and links
Merge pull request #242 from tspaeth/canary

Documentation update for multi-fallback languages
docs(guide/uk): Translation support multi-fallback
docs(guide/ru): Translation support multi-fallback
Merge pull request #243 from DWand/cyr-translations-support-multi-fallback

Uk/Ru translations support: multi-fallback
test(loaders): Repairs tests for fallbackLanguage + async loading

Fixes some logical mistakes
Merge pull request #247 from DWand/fix-fallback-language-loading

Tests fixes for fallback languages asynchronous loading
chore(landingPage): adds jhipster
Merge branch 'canary' of github.com:PascalPrecht/angular-translate into canary
fix(fallbackLanguage): Fix fallback languages loading and applying