Add angular-ui prefix to syntastic ignores

As AngularUI's suites are commonplace in Angular development, it's worth
relaxing the ignore rule to catch all ui-* prefixed attributes (e.g. `ui-view`,
`ui-sref`, `ui-sref-active`, etc.).
Merge pull request #3 from tlvince/refactor/angular-ui

Add angular-ui prefix to syntastic ignores