smuxi.sln: removed Debug-Win32|Any CPU build configuration
Merge branch 'stable'
smuxi.sln: removed non-existing project configuration mappings
Merge branch 'stable'
Frontend-STFL: Update manpage (signals are handled now)
Server: update manpage (signals are handled)
Engine: removed logging noise
Engine: introduce official Session.Shutdown() method
Frontend-GNOME: use Session.Shutdown() in Frontend.Quit()
Frontend-STFL: Implement _LocalSession and its init code
Frontend-STFL: Implement IsLocalSession
Frontend-STFL: Implement gentle session shutdown on quit
Frontend-STFL: handle signals
Merge pull request #176 from NattyNarwhal/stflsignals
Merge pull request #175 from NattyNarwhal/manupdate
[Engine] New partial message buffer implementation based on JSON and Git

- Include BSD 3-clause licensed ServiceStack.Text library for
  JSON serialization / deserialization
- Include GPLv2-only + linking exception licensed libgit2sharp library for
  storing messages in a Git repository
- Added DataContract attributes to MessageModel and related to hint
  the JSON serializer
- Initial partial GitMessageBuffer implementation based on Index
  - Implemented Add() and get_Count()
  - Stage all new messages to Index
  - Commit non-empty Index every 60 seconds
  - Commit on Dispose
[lib/libgit2sharp] Updated for public Index.AddToIndex() and UpdatePhysicalIndex()
[Engine] Implemented MessageDtoModelV1
[Engine-Tests] Added Newtonsoft.Json benchmark
[Engine] Use milli-second precision in MessageModel.Equals()