Support -a command line arguments

[lateefj]

For supporting and commandline arugment to pass to the binary there is a new '-a' option. Also my editor autoformats to gofmt so these files are cleaned up with the standarde format.

[marbemac]

@lateefj thanks for this - for now I'm just using his fork, but @pilu this would be very helpful to have in master

[gravityblast]

Hi guys, thank you for your work. I'm in the middle of a complete rewrite of fresh, and I would like to wait for that before merging this. can you please wait for some days (I hope :) ) so that I can finish it and we can prepare a similar PR for the new version?

[hiberabyss]

This will be useful!

[lateefj]

Should I close this PR and create a new on based on the rewrite @pilu ?

[adamcohen]

@pilu how's the rewrite coming along? If it's still really far away, any chance to get this merged in the meantime? Would really be keen to see this PR merged, since I'd like to use this feature.

[lateefj]

@pilu I rebased a while back any status on this?