add unit test for range
pass unit tests for range
add back npm test support
add travis support
add travis ci status image to README
simplify website url in README
add unit test for property
pass unit tests for property
subtree merge master branch into roole folder
allow unit tests to be run from doc
remove roole folder in doc
subtree merge latest tag into roole folder in doc
build latest tag in doc
change subtree merge message for doc