Ruruki

- Added in persistent graph support, which means that the graph will be stored on disk. See example below.
- Added in two new entities `PersistentEdge` and `PersistentVertex` which have an additional attribute `.path`.
- Removed the entry point plugins and removed the `create_graph` helper function due to the introduction of the persistent graph which takes a path. The `create_graph` provided not value and therefore was removed.

Eg:


graph
|_ vertices
| |_ constraints.json (file)
| |_ <label>
| | |_ 0
| | |_ properties.json (file)
| | |_ in-edges
| | | |_ 0 -> ../../../../edges/label/0_1 (symlink)
| | |_ out-edges
| | |_
| |
| |_ <label>
| | |_ 1
| | |_ properties.json (file)
| | |_ in-edges
| | | |_
| | |_ out-edges
| | |_ 0 -> ../../../../edges/label/0_1 (symlink)
|
|_ edges
| |_ constraints.json
| |_ <label>
| |
| |_0
| |_ properties.json (file)
| |_ ../../../vertices/0 (symlink)
| |_ ../../../vertices/1 (symlink)

WOW, pypi needs to work on its rst and markdown parsing. I removed the long description form the setup.py. I hope that fixes it.

Converted the README from rst to md to fix the pypi formatting.

Updated the readme doco to include ruruki-eye