Merged PRs

• 1068: Add -a flag to cli and DOLT_COMMIT
  This pr adds a -a flag to dolt commit and DOLT_COMMIT. It stages all tables.
  It also cleans up some of the previous work done in #1056 by removing all method handlers in repo_state and moving them to the RepoStateReader and RepoStateWriter
  It does not refactor the RSR/RSW interfaces in environment.go. This will be done in a subsequent pr.

Closed Issues

• 1067: Support dolt commit -a