Use Authkey in sources if there is one
Use Authkey in sources if there is one

Normally there is no authkey stored in the source tree. Instead
developers run "ant MakeAuthKey" to generate a personal authkey which
is then copied into the build tree.

However our branding branches include an authkey in the sources (in
war/WEB-INF), often customized for the installation. This change
causes this source resident key to over-ride the developer's personal
authkey.

Change-Id: I47761db8028d2432b3f5f0dcb1ece725ef5af0ac

mit-cml/appinventor-sources,jisqyv/appinventor-sources,jisqyv/appinventor-sources,jisqyv/appinventor-sources,josmas/app-inventor,mit-cml/appinventor-sources,josmas/app-inventor,josmas/app-inventor,mit-cml/appinventor-sources,jisqyv/appinventor-sources,jisqyv/appinventor-sources,mit-cml/appinventor-sources,josmas/app-inventor,josmas/app-inventor,josmas/app-inventor,mit-cml/appinventor-sources,mit-cml/appinventor-sources,jisqyv/appinventor-sources