Command#moveMouseTo should move relative to stored element context

Fixes theintern/intern#240
Correctly support documented optional args in pollUntil helper

Fixes #5
Fix documentation error

[ci skip]
Fix broken refresh feature detect

Fixes theintern/intern#216
Refactor some feature detection tests

This moves out a couple feature detects that were inappropriately
lumped in with a device touch API support, and converts remaining
uses of Promise.Deferred into direct Promise construction
Fix IE test failures
Fix test failure in Firefox 31/Selenium 2.42.2
Fix bad feature detection test in IE8

Also defensively don't ever use modern APIs in fallbacks like
scrollX/scrollY from CSSOM. It's 2001 forever and ever and ever.
Correct pollUntil documentation

Fixes #15
Update dojo2 dependency
Updating metadata for 1.1.0
Updating source version to 1.2.0-pre
Opt-out of automatic redirection handling in dojo/request

Fixes theintern/intern#274.
Use RFC-compliant URL parsing to redact auth credentials