fix(ngAnimate): fix property name that is used to calculate cache key

Fix property name that introduced a bug that occurs when there are 2 animations per page
with similar signature. Due to mistype they were assigned same cache key so second
animation was processed incorrectly

Closes #7566
docs(tutorial): make code samples in step 7 match code in angular-phonecat

Update step_07.ngdoc

Modifying the code snippets provided to match what was on git

Closes #7521
docs($rootScope): fix incorrect docs about how dirty checking is done
chore(shallowCopy): handle arrays and primitives, and switch to using it where possible

In many cases, we want a shallow copy instead of a full copy

Closes #7618
fix(angular.copy): support circular references in the value being copied

Closes #7618
fix(ngClass): support multiple classes in key
style(ngClassSpec): fix indentation to make jscs happy
docs(CONTRIBUTING.md): fixing link to Google Closure I18N library

The old seems to link to the source code of I18N. Found the same folder on their new Github repo.

"Closure Library's source repository has moved to GitHub.", https://code.google.com/p/closure-library/

Closes #7638
docs(ngKeyup): improve example

show implicit `$event` argument
docs(tutorial/step_05): improve explanation of _-prefix
docs(tutorial): add instructions to make experiment render readably in step 5

Update step_05.ngdoc

Closes #7653
docs(tutorial): add karma config update reference to step 11

When including the ng-resource module you appear to need to add a reference to the karma config file
as well or the unit tests will fail. This burned me for a while when going through the tutorial.

Closes #7651
docs(tutorial): fix minor errors in step 11

I added these when amending the previous commit. My bad ._.
docs(orderBy): add example of directly calling $filter('orderBy')

It's not a bad example of sorting fields in a table, which is something people are frequently wanting
to do. So I say, LGTM!
                        ~caitp, 1988-2014

Closes #7602
docs(*): fix its/it's grammar

Closes #7580
Merge pull request #2 from angular/master

Update README.md