Add additional parameter to load and unset target

[mushonnip]

This PR perhaps will solve #110

Now we can load and unset target by adding more parameter inside quotation mark

Example:

Load profile

proxyman load MyProfile "2 3 4 6 8" 

Unset proxy

proxyman unset "2 3 4 6 8" 

[himanshub16]

Thanks, @mushonnip.
Had been long since I last read proxyman's code. I'll take some time out and review this.