feat(ui-sref): support URL fragments in html5Mode

[encounter]

This provides support for specifying URL fragments in ui-sref attributes when HTML5Mode is enabled.

Thanks to @mismith for his original work in #1187.

[nateabele]

This syntax looks pretty hacky, and actually prevents the fragment from being parameterized, which is probably the default use case.

[encounter]

I went ahead and refactored it and fixed the tests, hopefully it's more straightforward now. Let me know if there's anything else I can do.

[encounter]

This doesn't work as expected after all, I'll see if I can find a better solution.

[mismith]

I'm not sure if I understand @nateabele's comment correctly, but if by "prevents the fragment from being parameterized" he means you can't use syntax like: ui-sref="stateName({param1: expressionOrValue, '#': hashExpressionOrValue})" then I know the code I wrote does indeed handle that. 2¢

[nateabele]

@mismith Correct.

[OnkelTem]

Any progress?

[stephengardner]

Is this feature added yet into ui router? It's been a while now

[nateabele]

Don't think so. If anybody wants to pick up the torch on this PR, I'd be happy to coach them.