Tags: go-make/make

VERSION_LDFLAGS now takes optional full path

- if path not specified then default to PWD
- this enables working outside of GOPATH

allow custom flags for install, and allow it to be extended

add "tools" rule to install all the things

fix update-tools

improve dep support, add clean-tools target

fix PATH issue inside golang container

protobuf/cs: use default file ext

protobuf/c#: class name was set to Stdin, dont do that

protobuf: update protoc, add c# and python generation

fix glide dependency issue