Initial Graph support implementation

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Merge branch 'devel' into 1.2_graph

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Minor Documentation and Code Reformatting for PSR-2

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Fixed _key not set in Edges

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Converted remaining $policy function parameters to $options arrays.
Added missing 'waitForSync' options

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Fixes and refactoring

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Defined some constants on the document class

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Defined some url parts for the graph API implementation

Signed-off-by: Frank Mayer <frank@frankmayer.net>
More Work on Graph API implementation + First Tests

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Some PHPDoc fixes

Signed-off-by: Frank Mayer <frank@frankmayer.net>