Set GOMAXPROCS=1 so that gometalinter manages threads.
Set GOMAXPROCS=1 so that gometalinter manages threads.

Fixes #462.

alecthomas/gometalinter,dnephin/gometalinter,alecthomas/gometalinter,dnephin/gometalinter,dnephin/gometalinter,alecthomas/gometalinter