Remove pointers in ZFinderElectron constructor

We want to store these objects in the event at some point, and so
copying the objects into the class is necessary to avoid the objects
from being deleted out from under the pointer.
Add GsfElectron to ZFinderElectron constructor
Format ZFinder.cc with astyle

The following command was used:

    astyle --style=google --break-blocks --pad-oper
    --align-pointer=type --align-reference=type --add-brackets
    --convert-tabs ZFinder.cc