Update README.md

Add gittip button:

Any tips will go towards this project, and  treats for contributors.
Fix module location for JSHint tests.

Previously, these tests were output in the same location as the original
file with the `.jshint` extension added on. This causes a number of
problems for anything that assumes a given module path contains certain
types. Specifically, adding an initializer would cause the build to
error since every module in `my-app/initializers` is assumed to export
an object.
Merge pull request #807 from rjackson/fix-jshinted-file-location

Fix module location for JSHint tests.
Use web notifications for betterifying your TDD

If your browser supports web notifications a new `Notifications`
checkbox will appear in the toolbar menu. When checked a `Fail`
notification will show when any tests have failed and a `Pass`
notification will show when all tests are green. Tomsters added for
scale.

Support for this feature is added through ember-qunit-notifications
Merge pull request #804 from bcardarella/bc-notifications

Use web notifications for betterifying your TDD