finishing brick.date.js
finishing brick.number.js
finishing brick.string.js
Merge branch 'feature.date' into dev
Merge branch 'feature.number' into dev
Merge branch 'feature.string' into dev
add test and build system
and bugfix
update README.md
    -- fix build status
    -- add license
fix building rule
adding developing version
finishing json module
finish brick.object.js and rearrange code