Fix EJSON base64 decoding when 'A' is 3rd or 4th char in a block

- Fix for https://github.com/meteor/meteor/issues/1001
return true/false from EJSON.isBinary

- From https://github.com/meteor/meteor/pull/1034
Support EJSON.clone(arguments)

- Fix for https://github.com/meteor/meteor/issues/946
- Includes
https://github.com/meteor/meteor/commit/afe5867f6870c127d336e0debbd21c46
6300ca29
update readme and version
Merge pull request #2 from emgee3/ejson-0.6.3-1-update

EJSON update