Allow specifying any GitHub user and commit in travis.sh

[tomjaguarpaw]

I would like to be able to use neil from my own GitHub repository. Furthermore I would like my packages to be able to specify a specific commit or branch to test with, firstly so that they don't have to be updated in lockstep with master and secondly to allow myself to test different versions of neil.

checkTravis expects a script stanza like this

- curl -sL https://raw.github.com/tomjaguarpaw/neil/<commit>/travis.sh | sh -s tomjaguarpaw <commit>

and it just checks that GitHub user name and commit match on both sides of the pipe.

[tomjaguarpaw]

To preserve the old behaviour change your packages' travis.yml scripts from

- curl -sL https://raw.github.com/ndmitchell/neil/master/travis.sh | sh

to

- curl -sL https://raw.github.com/ndmitchell/neil/master/travis.sh | sh -s ndmitchell master

[ndmitchell]

I'd be a fan of defaulting to ndmitchell and master, but allowing this customisation - which seems entirely reasonable.

[tomjaguarpaw]

OK, my latest version defaults to ndmitchell and master so your existing travis.ymls don't need to change.

[ndmitchell]

Thanks!

[ndmitchell]

I just followed up with a few cleanups to fix older GHC's and not require -s if you have no arguments.

[tomjaguarpaw]

Yes, good idea!