Corrected a couple of bugs
Created by: batatasfritas
- Added url_for_version because there was an issue downloading the file
- Forced linux64 as the final directory for the gurobi installation. Without this it does not work properly (at least when interfaced with Matlab). For more on this look at GUROBI_ROOT/linux64/matlab/gurobi_setup.m around line 70.
- Adjusted the run_env to take the previous modification into account.