v1.1.2, 09/02/2012 -- Minor update release.
* Added empty() function for Bundle.

v1.1.1, 01/02/2012 -- Minor bug fix release.
* Initialize Account identifier correctly.

v1.1.0, 30/01/2012 -- Updated release to support PROV_DM common relations.
* added a 'common' module to support PROV_DM common relations except 'Coolections'

v1.0.0, 30/01/2012 -- Initial release.