Separated predicates and conditions syntax
Refactoring:
- split titan implementation on parts;
- renamed EvalPath to Traverser;
Added vertex queries
Moved graph example data to resouces in GraphSON format
Fixed indexes creation (no label constraint)
Added local edge index declaration and cleation for Titan
Added composite indexes, creation in Titan, tested
Merge branch 'feature/vertex-queries' into feature/static-queries