Upgraded twitter4j to 3.0.3

Upgraded examples/pom.xml and TwitterSpritzer example to use twitter4j 3.0.3. Twitter example now works with a twitter4j.properties file in examples/bin/twitter that looks like so:

debug=true
oauth.consumerKey=*********************
oauth.consumerSecret=******************************************
oauth.accessToken=**************************************************
oauth.accessTokenSecret=******************************************