Add a new TCP server example written in C
rmdir: remove dir even if no such ops to rmdir
Makefile: add install target
Add dynamic ethernet module
Fix build error on some environments
Makefile: install: add missing libplanet.so
module_ops_type: add default lib path
Add PKGBUILD
Merge branch 'develop'

This merge includes:
 * Add 'make install'
 * Fix build error on some environments
PKGBUILD: no need to checkout brach 'develop'