Dgraph v0.7.0 release

Features:

• Fault tolerance using RAFT.
• Ability to take backups using HTTP.
• Consensus based mutations.
• Auto assign uids as part of mutations.
• Filters - Term matching
• Schema system.
• Storage types.
• Indexing for all data types.
• Tokenize English and CJK strings using ICU.
• Support for clean exit of Dgraph server using HTTP.
• Support GraphQL field alias.
• Support functions at root.

Improvements:

• Speed up_count_ queries.
• Support count with filtering and pagination.
• Make mutations concurrent in RAFT.
• Dgraphloader now runs mutations over HTTP.
• Serve HTTP and gRPC requests through same port using cmux.
• Replace gotomic map with an efficient sharded go-map.
• Batch write commits to RocksDB.
• Move away from gorocksdb and have own cgo wrapper.
• Track server statistics in /debug endpoint.
• Simplify the logic for posting lists.
• Switch from Flatbuffers to Protocol buffers.
• Use same traversal to generate JSON and Protocol buffer results.
• Update to RocksDB 4.11.2.