Support inline-tag in firstLine filter.

```
{$ component.description | firstLine $}
```

I create dgeni template. but happen warning.

```
warn:    No handler provided for inline tag "{@link</p>  |
| $rootScope | <p>Every application has a single root {@link ng.$rootScope.Scope scope}" - doc "module:ng.service" (componentGroup) 
```

firstLine should return the contents until inline-tag closes.
We can probably do this with a clever regex...