Get File Wrong Content-Type Bug Fix
Get File Wrong Content-Type Bug Fix

JIRA: CBDEUCE-99

- Bug Fix: Fixes the content-type with the exception of an extraneous semi-colon

Note: Pecan Response object is really just the WebOb.response.Response object.
There is a funny rule in the WebOb.response.Response object such that setting
the content-type to a value will by default append any existing values. If,
however, the value includes any parameters or even just a semi-colon then it
only uses what is provided and does not do any appending of existing data.

rackerlabs/deuce