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Create GraphDatabase.js

Needs lots more comments... lots more...
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####Changes
+Added some comments
+Added read method, byKey() function to get object key/value pairs
+Redesigned _parseEntities() method to return object key/value pair for UID only
+Adjusted all other methods to implement the redesigned parseEntities() method
Update GraphDatabase.js

+Added edges to object return by read() method
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MIT License
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