discussion: maintain packages out of this project

[yorkie]

Currently all the packages are maintained inside the YodaRT project, we had plan to move these packages as separate NPM package, that's why we call the directory is packages. However moving these packages completely to be separate should address the following issues:

• how to test
• how to integrate
• how to install

And there are the following actions to be done:

1. The package tests and source code shall be moved to separate git repository. As for testing of packages, discussed with @cheongwen, we don't need the complete test on ARM-based devices, so the test on travis/circle is enough for packages.

2. At YodaRT, install packages via NPM instead of CMake, to ship this ASAP, we could ln the node_modules/@yoda/{name} to packages/@yoda/{name}.

/cc @Rokid/yodaos