ALLJOYN-1779 Create an MSI install program for the AllJoyn SDK for Windows 7

This involves proper dependency checking in the Sconscripts by returning
the build products.

Change-Id: Ied323b4cbf5f4537b4daa30e5008219ff0279b57
ALLJOYN-1771 Fix crash in winrt timer due to race condition.
Also, fixed the preventReentrancy functionality.

Change-Id: Ib12b58488c3358698ff8d65e8cace4318fa1546d