chore(ngClass): remove debugger statement from an e2e test
style(License): update copyright year

Closes #6090
chore(Gruntfile.js, package.json): use load-grunt-tasks and move grunt-contrib-jshint into devDependencies

Closes #6085
fix(mocks): always call functions injected with `inject` with `this` set to the current spec

Currently when a function is injected inside of a test we set the context to undefined which
is a bug.

Closes #6102
refactor(mocks): simplify the  implementation
docs($q): fixed grammatical error

"Promises" should be of the possessive form.

Closes #6082
docs($compile): fixed syntax error.

"how to" was written twice in a row.

Closes #6110
fix(ngResource): don't filter "$"-prefixed properties from ngResource requests/responses

ngResource no longer filters properties prefixed with a single "$" character from requests or
responses, correcting a regression introduced in 1.2.6 (cb29632a) which caused shallowCopy and
shallowClearAndCopy to ignore properties prefixed with a single "$".

Closes #5666
Closes #6080
Closes #6033
docs(CHANGELOG): add breaking change notice for 1.2.9 $http default headers change

Add a mention for the slightly breaking change introduced in 1.2.9.

Closes #6022
chore(release): be able to release any commit

The version information is now stored only in the tags.
By this we are able to release commits in the past, which
have already been tested, so we don't need a code freeze
or run tests any more. This is also the first step for
letting Travis do the releases in the future.

The package.json now contains the new
property 'branchVersion' that defines which tags are
valid on this branch.