create sub command with commanderjs;workaround for commanderjs bugs
solve #19
add npm.js try to wrap npm
npm wrapper in ./lib/npmw.js; see samples in ctx-sample.js; issue #21
wrapping to prototype
remove log/debug;make npmw singleton
version validator fix #12
add ctx install
Merge branch 'cortex-install' into cortex-2.0
fix conflicts