api: fixed problem with setting repo group description via API. - fixes #5423

age: use local flag to fix the problem of wrongly reported last update times on repository groups. - fixes #5341

dashboard: show date of commit inside the tooltip.

metadata: store workers and prevent to excesive metadata writes.

release: update copyright year to 2018

pull-requests: allow opening PR from changelog based on selected refs for git as well as hg.

reviewers: colorify the groups

default-reviewers: introduce new voting rule logic that allows defining vote rules for user groups assigned to the default reviewers. - allows to set per number votes on user groups - group reviewers by groups - store the rules and show them in the UI - fixes #5409

files-source: allow making a range selection with shift on file lines.

repository: fixed a bug when scoped token was attached to repository, admins were unable to remove that repository.