Update Loading content

[Urbiwanus]

I would be nice to update the content of Loading while its visible.
Since Angular provides notify for promises. An updateable loading content would be great to present the current state of a long running process.

Detail please see : http://forum.ionicframework.com/t/update-loading-content/1435/2

[ajoslin]

Added via cb1a5f6.

Use $ionicLoading.show() while the loader is open with new content, and it will update the content.

[ionitron-bot]

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