Adding support for Martini & Goji frameworks - Go

Adding benchmark support for Martini & Goji, two web frameworks for Go.

See: 
   - http://martini.codegangsta.io
   - https://github.com/go-martini/martini
   - https://github.com/zenazn/goji
   - https://goji.io
Per some changes in #915, please remove this line. Add a new file at `goji/bash_profile.sh`, and inside it put the line `export GOPATH=$TROOT`

Actually, to preserve any existing gopath, perhaps use `export GOPATH=$TROOT:$GOPATH` (is that how gopath works?)