Merge branch 'chrisrus/develop' v0.7.1 maintenance release + docs.

Merge pull request #52 from Encapsule/chrisrus/develop

Bug fixes to DirectedGraph serialization API

Merge pull request #46 from Encapsule/chrisrus/develop

Chrisrus/develop taking fixes for issues #41 #42 #43 and #47 + a few small doc updates as v0.6.1 release.

Merge pull request #40 from Encapsule/chrisrus/develop

Chrisrus/develop documentation edits bumps to v0.5.14

Merge pull request #39 from Encapsule/v0.5-RC0

V0.5 RC0 (v0.5.13)

jsgraph v0.4.0 (BREAKING CHANGE FOR PERSISTED JSON DATA) ...

... simplifies the JSON export format, removes package.json self-reference, and fixes a bug on JSON import. Note that if you have v0.3.0 JSON jsgraph data (e.g. in a database or file) it's not going to parse with v0.4.0 until you modify the outer JSON to: { jsgraph: { digraph: { vertices: [], edges: [] } } (new JSON I/O format).