Adapt mozregression to take a binary as a parameter

The mozregression script, included with transgression, should be modified to be able to take a binary configuration and utilize it, rather than be hard coded to work with Firefox.

Note that the code to generate a profile needs to be commented out, since we're not going to use this in the first release. Thus, transgression will not be able to search for Firefox regressions in the first release.

Start by locating the mozregression script included with transgression and inspect how it currently assumes Firefox and generates a profile. Done means the script accepts and uses a binary configuration, while the profile-generation code is commented out for the first release; no tests or specific file paths are mentioned.

Written by the indexing model from the issue text.