Release 1.6

What's Changed

• Query module for connecting to ElasticSearch by @as51340 in #170
• bump mg version for 2.5.2 release by @brunos252 in #195
• Port dynamic graph analytics to the C++ API by @antepusic in #182
• Rewrite distance calculator in C++ by @antoniofilipovic in #191
• Add meta_util.schema procedure that generates graph schema as a graph result by @tonilastre in #187
• Reorganize setup script by @antoniofilipovic in #194

Full Changelog: v1.5.1...v1.6