Remove submodule, opal submodule is really not needed unless for deve…

…lopment

bump version - 0.5.1

use #import instead of @import

Add cache to compile ruby

bump version - 0.3.1

Revise how to manage resources -- copy all *.rb into a separate Opal.…

…bundle

add irb mode support

bump version - 0.2.3

bump version

bump version - 0.2.1

add LICENSE