Latest jquery-1.9.js externs file is broken
Latest jquery-1.9.js externs file is broken

We get a compile error with the latest jquery-1.9.js externs file:

```
ERR! compile .build/externs/jquery-1.9.js:94: ERROR - accessing name jQuery in externs has no effect. Perhaps you forgot to add a var keyword?
ERR! compile var $ = jQuery;
ERR! compile         ^
ERR! compile
ERR! compile
ERR! compile 1 error(s), 0 warning(s)
ERR! compile
ERR! Process exited with non-zero status, see log for more detail: 1
```

This commit fixes the problem by fetching the jquery-1.9.js file from a specific commit.

camptocamp/ngeo,ger-benjamin/ngeo,adube/ngeo,pgiraud/ngeo,pgiraud/ngeo,Jenselme/ngeo,adube/ngeo,camptocamp/ngeo,kalbermattenm/ngeo,pgiraud/ngeo,camptocamp/ngeo,adube/ngeo,kalbermattenm/ngeo,Jenselme/ngeo,camptocamp/ngeo,kalbermattenm/ngeo,adube/ngeo,camptocamp/ngeo,Jenselme/ngeo,ger-benjamin/ngeo,ger-benjamin/ngeo,Jenselme/ngeo