Hotfix for CloudGraphConfig serialization

Minor release to fix and issue with serialization of the CloudGraphConfig structure.

Julia 1.0 Compatibility

Switched to using new Mongoc.jl package and compatible with Julia 1.0.

Julia 0.7 Compatibility

Upgraded to support Julia 0.7.
Note that this package will be deprecated in favour of DistributedFactorGraphs.jl in the following release.

Packed Types Enhancement

This release includes @dehann's enhancement for packed types.

Improved management of big data store.

• Use of mime types for hints to data type
• Use of key for source name - can now potentially define multiple big data sources
• Explicit flag for adding+saving big data when adding or updating a node
• No more OID as key, rather use a technology-independent key. Allows us to lift+shift data without worrying about keys. This will be done in the graph in the next update as well
• Adopting pattern of hard-typing parameters and returns. This is essential in building a maintainable+testable framework.

v0.0.2

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