Xmp-tool

* Fix test following a bugfix from Exempi 2.4.0.
* Fix crash when there is no schema.

* Fixed documentation code examples (issue 34)
* Removed print statement.
* Enabled insertion of new struct into array (issue 33)
* Thanks to Fenykepy for bug reports.

* Added support for Python 3.3, dropped support for 2.5.
* All string outputs in 2.6 and 2.7 are unicode objects with UTF-8 encoding.
* Added exempi module, a low-level ctypes interface to exempi library.
* Most XMPMeta methods that formerly returned bool now raise exceptions in
case of failure, except for "does_property_exist", "does_array_item_exist".
* Added timezone support for datetime routines.
* Added delete_localized_text method to XMPMeta

* Fixed python 2.5 issue (ctypes.c_bool are not available in 2.5, so it was
changed to ctypes.c_int).

* Fixed issue on 32-bit systems.

* Known issue 7 documented - issue with TIFF smart handler.
* Fixed issue 15 - 64-bit issues on Linux and Mac.
* Fixed issue 11 - Typo in does_property_exist.
* Thanks to marialaura.clemente for bug reports and patches.