Fix box-name detection on argv

[stesie]

Hi Marc,

according to the README file something like vagrant run your_box your_command should work in a multi-vm environment. However "your_box" is expected to be a box uuid in that case, which is kindof cumbersome ...

this is due to checks like

command = argv[1].to_s if env.machine_index.include?(command)

... where Vagrant::MachineIndex::include? takes a UUID (meanwhile?). Maybe some API change somewhen, but haven't checked.

This patch switches behaviour to expect box names instead of UUIDs.
For me this is ok but YMMV, let me know if you'd like it to be changed to support both UUID and name.

[coveralls]

Coverage increased (+0.02%) to 96.763% when pulling 1ef258e on stesie:fix-argv-box-name into b673fc2 on mneudert:master.

[mneudert]

This seems to be broken for "quite some time" without being noticed. Backported your fix to v0.7. Will probably apply the naming difference to this PR and then merge.

Could you rebase this on on top of the new master (#2 merge) for some history cleanup love?

[stesie]

sure, here we go

[coveralls]

Coverage increased (+0.02%) to 96.548% when pulling b955d41 on stesie:fix-argv-box-name into 706e2d4 on mneudert:master.

[coveralls]

Coverage increased (+0.02%) to 96.548% when pulling 92e2063 on stesie:fix-argv-box-name into 706e2d4 on mneudert:master.

[mneudert]

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