fix fakeXHR when response is function handler and url contains RegExp characters

[salomvary]

The problem here was that String.exec accepts RegExp or string, in the latter case compiles the string into RegExp using new RegExp(string). This might not match in case we ended up here because fake_server.js#L54 matched by string equality.

[imtapps]

+1 This seems to fix issue #201

[toranb]

How is this not merged into master yet? Are there issues w/ this approach or is something missing in the attached pull request?

[williamsbdev]

There is a passing test and this fix is exactly what is needed. +1 to fix #201

[cjohansen]

Thanks! Sorry about the late response, I simply had failed to notice this...