Rename class ContentObject to Data. Make a deprecated class ContentObject which inherits Data. Make UpcallInfo also set the deprecated contentObject member. In EncodingUtils, added encodeToHexData, etc. and deprecated encodeToHexContentObject. Refs #1062.
Merge branch 'issue/1062-rename-ContentObject-to-Data'. Refs #1062.
http://redmine.named-data.net/issues/1062