add Object#__tag__
fix #8
Merge pull request #7 from mohayonao/__tag__

add Object#__tag__

use to detect type of data in internal
add testem
Merge pull request #9 from mohayonao/testem

add testem
add NotYetImplemented

build v0.0.6
Merge pull request #10 from mohayonao/classlib

add NotYetImplemented as placeholder
Merge branch 'master' into gh-pages
up