Missing methods to add callback for resume, pause events

[pencilcheck]

http://docs.phonegap.com/en/1.3.0/phonegap_events_events.md.html#resume
http://docs.phonegap.com/en/1.3.0/phonegap_events_events.md.html#pause

Should be added to $ionicPlatform.

[adamdbradley]

Good idea, thanks

[adamdbradley]

Also, I only added an on method so we can reduce the amount of code most people won't even use, and some of the event listeners require additional plugins to be added. But the on method would make it easier by adding and removing the listeners at the right time in the lifecycle.

[pencilcheck]

Cool, thanks for the swift response.
I guess this will be out in the next version?

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