Revert "Stack of initialized graphs was created to gracefully handle nested graph createions."

This reverts commit e6eb74bf39f58694494629427d0e52db9bb06860.

Conflicts:
	graphdb/src/main/java/com/tinkerpop/blueprints/impls/orient/OrientBaseGraph.java
Merge branch 'develop' of github.com:orientechnologies/orientdb into develop