17081 Upgrade to Angular 1.3

https://community.openproject.org/work_packages/17081
When I checked out this branch and ran ``bower install`` I got the following message:
```
Unable to find a suitable version for angular, please choose one:
    1) angular#~1.2.14 which resolved to 1.2.27 and is required by openproject-ui_components#e9750ed700 
    2) angular#^1.2.13 which resolved to 1.2.27 and is required by angular-modal#cc565b7089 
    3) angular#1.2.27 which resolved to 1.2.27 and is required by angular-animate#1.2.27 
    4) angular#~1.2 which resolved to 1.2.27 and is required by angular-busy#4.0.4 
    5) angular#1.3.6 which resolved to 1.3.6 and is required by angular-animate#1.3.6, angular-animate#1.3.6, angular-mocks#1.3.6 
    6) angular#~1.3 which resolved to 1.3.6 and is required by angular-busy#4.1.2 
    7) angular#>=1.2.0 which resolved to 1.3.6 and is required by angular-ui-select2#0.0.5 
    8) angular#~1.x which resolved to 1.3.6 and is required by angular-ui-date#0.0.3 
    9) angular#>= 1.0.8 which resolved to 1.3.6 and is required by angular-ui-router#0.2.11 
    10) angular#>= 1.2.5 which resolved to 1.3.6 and is required by angular-context-menu#0.1.8Prefix the choice with ! to persist it to bower.json
```
though [v1.3.5](https://github.com/angular/angular.js/releases/tag/v1.3.5) seems still be available.