Add a polyfills.js file. Add Function.prototype.bind

fixes #108
Rename `switch` to `showView`

* `switch` is a reserved word that causes IE8 to blow its lid.

fixes #179
Assume 'en' as the default language.

* window.navigator.language is unsupported by IE8. This is a workaround until we do some server side work.

fixes #183.
Merge pull request #180 from mozilla/issue-108-shim-bind

Add a polyfills.js file. Add Function.prototype.bind
Merge pull request #181 from mozilla/issue-179-switch-reserved

Rename `switch` to `showView`
Merge pull request #184 from mozilla/issue-183-navigator-language

Assume 'en' as the default language.
Add the fx-desktop channel & start to set up front end unit tests.

* add mocha & chai to the bower config