Panic on startup without GPM

[RobCherry]

Built via go get github.com/bitly/oauth2_proxy command provided in the readme.

Appears to have been caused by mreiferson/go-options#4.

panic: interface conversion: *main.StringArray is not flag.Getter: missing method Get

goroutine 1 [running]:
github.com/mreiferson/go-options.Resolve(0x8692c0, 0xc8200c8580, 0xc820037ee8, 0xc82008af90)
    /go/src/github.com/mreiferson/go-options/options.go:86 +0xe7c
main.main()
    /go/src/github.com/bitly/oauth2_proxy/main.go:93 +0x15e6

The installation steps in the readme need to be updated to reference using https://github.com/pote/gpm, or changes need to be made to support the latest version of go-options.

[mreiferson]

whooops

[mreiferson]

You should probably use godep to build the binary, though, so you don't pickup random changes to master in its dependencies.

[RobCherry]

@mreiferson Yeah, using https://github.com/pote/gpm I was able to get it building again. I am going to update the issue to reflect that this project will not run with the latest versions of https://github.com/mreiferson/go-options.