Fix mime-type detection for urls

Previously, pasted media urls with '?' in them (among other things,
probably) caused mime detection, via node-hubble.mofoprod.net to fail.
Node-hubble truncated the url at the '?', causing it to try detecting
the mime type of the wrong url.

For a concrete example, pasting in the following url (file id
redacted) previously caused a 'This media source is unplayable' error
because it was getting back a mime type of text/plain (an error page,
actually):

https://ec2cdn6.callinfo.com/cloudProxy/cloudProxy?request=https://cc.readytalk.com/cc/s/media/file/REDACTED_UUID/video.mp4

With this fix, the url works swimmingly.
v2.0.115
Bug 1008247 - Update to webmaker-auth-client v0.1.0
Bug 1010375 - Update to newrelic v1.5.5
2.0.116
Bug 1014432 - Update to webmaker-auth-client v0.1.2
2.0.117
Bug 1015639 - update webmaker-auth-client
Add webmaker id to Project model
Bug 1019636 - Don't crash server when make fails to be created
2.0.118
No bug - Rename files with dates
No bug - update userid migration script
2.0.119
Bug 1015313 - Last bits needed for email -> userid migration
2.0.120
Bug 1015313 - Last last bits needed for email -> userid migration
2.0.121
Bug 1015313 - ...
2.0.122