instance.rte -> IE8/9 compatibility

[andrewcharnley]

1. revert router to hash operation (1.4)
2. rename all Promise .catch to 'catch'
3. fixup instance.rte for IE. (1.5)

[andrewcharnley]

1, 2 complete (1.4)
3. ongoing (1.5)

[andrewcharnley]

Since instance.rte is not a priority for the 1.5 release this is moved to 1.6