support setting a profile for running firefox selenium tests
support setting a profile for running firefox selenium tests

Change-Id: Ic5ca18ca432076c443b0b46e8e25e6480856509e
Reviewed-on: https://gerrit.instructure.com/3523
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: JT Olds <0857133ffcd232122dc51ad55bf5fcc9d60af5d3@instructure.com>

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