Initial p-graph commit

Signed-off-by: Matt Schaub <matt.schaub1337@gmail.com>
Merge branch 'master' of https://github.com/skoechle/sobek

Conflicts:
	source/sobek-workflow-engine/pgraph-ejb/pom.xml
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/Node.java
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/NodeType.java
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/PgraphDao.java
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/PgraphManager.java
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/entity/NodeEntity.java
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/entity/PgraphEntity.java
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/material/Material.java
	source/sobek-workflow-engine/pgraph-ejb/src/main/java/com/sobek/pgraph/operation/Operation.java