Adjust the regular expression and run grunt build

When running tests, I got some errors from `ng.django.forms`. 

```
➜  client git:(master) grunt test-all                                                          
Running "jshint:files" (jshint) task
>> 5 files lint free.

Running "karma:test-all" (karma) task
INFO [karma]: Karma v0.12.21 server started at http://localhost:9090/
WARN [launcher]: Can not load "Safari", it is not registered!
  Perhaps you are missing some plugin?
INFO [launcher]: Starting browser Chrome
INFO [launcher]: Starting browser ChromeCanary
INFO [launcher]: Starting browser Firefox
WARN [launcher]: Can not load "Opera", it is not registered!
  Perhaps you are missing some plugin?
ERROR [launcher]: Cannot start ChromeCanary
	Can not find the binary google-chrome-canary
	Please set env variable CHROME_CANARY_BIN
INFO [Chrome 36.0.1985 (Linux)]: Connected on socket ApS05JMAIFwfp-nZXZEW with id 78107582
INFO [Firefox 30.0.0 (Linux)]: Connected on socket Wt_O2Csr3DPeJmccXZEX with id 44026236
.....
Chrome 36.0.1985 (Linux) unit tests for module ng.django.forms test directive validateDate to accept 2014-04-01 FAILED
	Expected false to be true.
	Error: Expected false to be true.
	    at null.<anonymous> (/home/fabio/devel/django-angular/client/tests/djangoFormsSpec.js:96:35)
Chrome 36.0.1985 (Linux) unit tests for module ng.django.forms test directive validateDate to reject 2014-04-31 FAILED
	Expected true to be false.
	Error: Expected true to be false.
	    at null.<anonymous> (/home/fabio/devel/django-angular/client/tests/djangoFormsSpec.js:102:35)
....................
Chrome 36.0.1985 (Linux): Executed 25 of 25 (2 FAILED) (0.157 secs / 0.147 secs)
...
Firefox 30.0.0 (Linux) unit tests for module ng.django.forms test directive validateDate to accept 2014-04-01 FAILED
	Expected false to be true.
	@/home/fabio/devel/django-angular/client/tests/djangoFormsSpec.js:96:4
	
...................
Firefox 30.0.0 (Linux): Executed 25 of 25 (1 FAILED) (0.186 secs / 0.17 secs)
TOTAL: 3 FAILED, 47 SUCCESS
Warning: Task "karma:test-all" failed. Use --force to continue.

Aborted due to warnings.
```