Rename releasing document because reasons.
Merge pull request #500 from projecthydra/make_markdown_consistent

Rename releasing document because reasons.
Drop no longer used submodule for hydra-jetty
Merge pull request #501 from projecthydra/dump_jetty_submodule

Drop no longer used submodule for hydra-jetty
Allow hydra-head 7.1.0 to be used
Merge pull request #502 from projecthydra/allow_hydra-7-1

Allow hydra-head 7.1.0 to be used
Use mailboxer 0.12.0
Merge pull request #503 from projecthydra/mailboxer_0-12

Use mailboxer 0.12.0. Fixes #499
Lock hydra-editor to ~> 0.3.0
Use the bootstrap_form helpers (bootstrap_forms is no longer available)
Merge pull request #504 from projecthydra/hydra-editor-0-3

Lock hydra-editor to ~> 0.3.0
Preparing for 4.0.0.rc1 release