Allow a .proto include path to be specified on the command line about grpcc

[chakming]

i make a hacky one: https://github.com/chakming/grpcc

1. according to discssion here, grpc usage could be grpc.load({root:'your/root', file: 'your/file'}) which help to load multiple files
2. if load multiple proto at the same time and those package names are different, we need to have a power to let people choose the package name. I've implemented it with inquirer

[chakming]

you can try the version with the following:

1. npm install -g git://github.com/chakming/grpcc.git#master so to install a specific npm repo from github
2. run the command with one more directory (didn't make a default one = pwd yet) with protos under same directory: grpcc --proto helloworld.proto --directory $(pwd) --addess 127.0.0.1:3466 --insecure

[njpatel]

@chakming nice one! Would you want to do a PR to the main branch? Would love to have this part of a fix-up release I'd like to do by the weekend.

[chakming]

sure i'd love to, just updated to fix the ci tests too

[njpatel]

I pushed up v0.0.3 to npm just now, with your work included. Thank you!