Provide lo-autofocus as a pf-autofocus directive

[lfryc]

LiveOak's lo-autofocus directive is implemented here:

https://github.com/liveoak-io/liveoak/blob/792ef16af6cba1c5d452f2f3cd8f8f5a679df8d5/console/src/main/resources/app/js/directives.js#L258

It would be handy to expose it as pf-autofocus directive to allow sharing this functionality between diffirent consoles.

[vrockai]

Sure, work in progress.

[lfryc]

Link to AeroGear issue: https://issues.jboss.org/browse/AGPUSH-722

[ammendonca]

There's a conditional focus directive, lo-focused which should work better in dynamic situations. Not sure it's worth keeping both directives or if they should be combined (i.e., lo-focused with no args work as lo-autofocus).

[kenfinnigan]

Included by #5