Fix a possible memory corruption in Klass

This commit fixes a bug in Klass which lead to memory corruption.
The bug was that Klass::__voodooInstanceName was not initialized in
constructor. This lead to memory corruption, for example, in voodooVoidCall
in growingString.append( __voodooInstanceName ).
Merge pull request #7 from rafi-stratoscale/rafi/fix_uninitialized_members_in_Klass

Fix a possible memory corruption in Klass