use go1.4 (devel) branch to support additional range syntaxes, simplify GOROOT handling
use go tip in travis (to get go1.4; will have to change to 1.4 when it is released)
use src v0.0.24
document GOROOT config field
whitespace
support GOPATH config in Srcfile
whitespace
Merge pull request #15 from sourcegraph/go14

Go 1.4, custom GOPATH