add news item for myrepos 1.20140831.1
Add darcs grep command using ack-grep
changelog
mr: create temporary file with '.mrconfig' suffix
mr: fix 'bootstrap' action

This commit removes strange magic, that should "handle checkout of the
'.' repo". With such modifications, 'bootstrap' action became to work
properly.
Merge remote-tracking branch 'upstream/master'
1.20140831.2-alt1

- update to 1.20140831.2
- mr: create temporary file with '.mrconfig' suffix
- mr: fix 'bootstrap' action