Modified GOPATH to not modify build with go.mod
Updated go.mod to version 1.12
Updated harness to setup listener before killing process
Updated notvendored flag to --no-vendor
Updated command_config to ensure no-vendor can be build
Added additional checks in source path lookup
Added a gomod-flags parameter which allows you to run go mod commands on the go.mod file before the build is performed. This allows for development environments.
Added packagepathmap to the SourceInfo, this in turn allows the RevelCLI app command to pass the source paths directly to Revel directly
Added default to build to be "target" of the current folder
Renamed source processor
