Release for v1.0.0-rc1

This release adds the following enhancements and functionality:

• Add an upgrading SQL script file from 0.5.0 to 0.6.0
• Add upgrading file age--0.6.0--0.7.0.sql
• Refactor function get_agtype_value_object_value
• Age load issue (issue #188)
• Refactor agtype_access_operator
• Bugfix - Remove INLINE from function declaration
• Rebase VLE code
• Implement Merge Clause
• Bugfix: chained union logic
• Allow a path of one vertex
• Created functions for load graph from CSV files
• Add UNION into EXPLAIN grammar rule
• Implement UNWIND clause(issue #173)
• Bugfix:(nodejs) Corrects parsing for independence value(issue #177)
• Feat: Implement OPTIONAL MATCH (issue #175)
• Update copyright in NOTICE