Version 0.3.1

Version 0.3.1 was released on 16 Nov 2018.

Minor release with bug fixes and error traces

Closed issues #1 and #5
Added the trace log for the add-in activity
Deprecated m_App, m_CmdMgr, m_AddInCookie fields. Superseded by App, CmdMgr, AddInCookie properties respectively,