[Engine-IRC] Fixed NullReferenceException in _OnNames() (closes: #801)

/quote NAMES #NotJoinedChannel leads to a disconnect because of an unhandled
NullReferenceException thrown in IrcProtocolManager._OnNames().
Merge branch 'stable'
[Engine-Campfire] Use a space to separate the user and the action text

This became missing in a recent refactoring.
Merge pull request #20 from carlosmn/add-space
[Frotend-GNOME] Initialize "Use Encryption" and "Validate Server Certificate" checkboxes correctly (closes: #803)
Merge remote-tracking branch 'github/master'
[Engine] Use assembly name instead of noisy title in version string
[Frontend-GNOME] Fixed thread/memleak when reconnecting frontend (closes: #805, refs: #667)

Reconnecting to the smuxi-server was leaking all ChatView objects as
the ChatViewManager.ChatRemoved event was never raised from
ChatViewManager.Clear(). Thus StatusIconManager, NotifyManager and
IndicateManager continued to reference ChatViews objects. This leaked the
LastSeenHighlightQueue thread and probably also GTK+'s TextBuffer used in
MessageTextView.

Now we use the regular cleanup code of ChatViewManager.RemoveChat() instead.
Merge branch 'stable'
[Frontend-GNOME-IRC] Fixed whois, kick, ban and query menu commands with multiple persons
Merge branch 'stable'
[Engine-Campfire] Fixed build on Mono 3.0
[Installer-Win32] Download our GTK# 2.12.10 for .NET package

Use our package as download.mono-project.com ships a broken one that doesn't
install on Windows XP.
Merge branch 'stable'
[Frontend-GNOME] Added undocumented /gc command which triggers the garbage collector
[Frontend-GNOME] Fixed a few leaking refrences to ChatView (refs: #667)
[Frontend-GNOME] Fix remaining ChatView memleak (refs: #667)

Release TreeViewColumn.SetCellDataFunc() callback in ChatView.Dispose()
Merge branch 'stable'
[Build] Fixed whitespace
[Frontend-GNOME] Explicitly dispose TextTagTable to fix leaking LinkTags (refs: #667)