Merge branch 'master' into develop
tests for acceptance non-deletion, and tweaks to others
engine support for acceptance non-deletion
interface for acceptance non-deletion
Merge pull request #55 from haaksmash/feature/55-maybe-acceptance-isnt-fatal

Feature: add option to prevent accepted from deleting remote branch
necessary changes to engine and core"
moving pains
changes to simplify managerial duties
feature manager takes over branch finding - fixes #56 as well.
complete overhaul of tests for engine
adds managers for hotfixes and releases
updates tests for engine to consider release and hotfix
makes engine pass its tests
adds hotfix and release branches to manager init args
fixes and polishing to managers
test fixes
fixes to engine
adds a bit more summary to release manager contribute
adds return values to some hotfix manager method
fixes to core and its tests