Binding more class in IO lib to Lua, Fixed multi inheritance class.

git-svn-id: http://urho3d.googlecode.com/svn/trunk@2639 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Optionally remember last resource path in editor.
Remember last import path in editor.
Set node / scene / UI element picker paths from remembered resource path if possible.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2640 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Added Lua Chat sample.

git-svn-id: http://urho3d.googlecode.com/svn/trunk@2641 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Fixed Lua Chat sample bug, Replace Variant's constructor with SetXXX function.

git-svn-id: http://urho3d.googlecode.com/svn/trunk@2642 3bd170d8-ddcf-f82c-f583-7a401ccf5608