IE8 compatibility

[mdissel]

SP 2013 still supports IE8, angular 1.2* also supports IE8, but the ng-sharepoint lib contains one small IE 8 issues.
The promise catch/finally is not supported in IE8. Both could be replaced with ['finally'] and ['catch'], but i can't get the catch to work at this location. Is this really necessary or could we replace this with then(..,..)?

https://github.com/Kaldeera/ng-SharePoint/blob/master/src/sharepoint/services/splistitem.js#L703