Implemented 'oneOf' keyword, removed some unnecesary prints and minor updates
merge
'anyOf', 'oneOf' and 'allOf' implemented. Tests added

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JSON LIBRARY UPDATES
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+List of changes:

	1) jsongen.erl:

		+Implemented keywords 'anyOf', 'oneOf' and 'allOf' ('not' keyword still not implemented)

		+Minor updates and some cleaning up

	2) jsonschema.erl

		+ Minor updates to improve efficiency

	3) json_validate.erl

		+ Minor updates

	4) Updated and added tests for 'oneOf', 'allOf' and 'anyOf' keywords