Pyxnat

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* New Features

* Improvements

* Bug fixes
- Ticket 50 404 error causes connection to be broken until end of object life.
- Tiekct 52 fix zip file downloading.

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* New Features
- Add __getitem__ to CObject for slice operations.


* Improvements
- Add toggle for overwriting files on the Resources object (put, put_dir, put_zip)
- Add toggle for not extracting the zip file on the Resources object (put, put_dir, put_zip)

* Bug fixes
- fix proxy support
- mset attributes fixed
- fixed url separator issue on windows.

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* New Features
- add proxy support to interface.

* Improvements

* Bug fixes
- python <2.7 compatibility.
- project.parent() does not throw error.
- removed simplejson requirement
- md5 cache key

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* New features
- Global listing functions:
- interface.array.experiments()
- interface.array.search_experiments()
- interface.array.scans()

- Support for XNAT configuration file format
- Batch function for downloading all files related to a scan or an assessor
- Create element with an XML document
- New xpath function for EObjects
- xpath store facility to query cached subject XMLs with xpath

* Improvements
- Catching authentication errors
- Toggle option for cache warnings
- Description for search templates is displayed

* Bug fixes
- Config file

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* Compatible with XNAT 1.5

* New features
- provenance annotation on assessors and recontructions
- search templates
- callback system to monitor data streams to and from the server

* Improvements
- support for proxies in the Interface object
- a description can be added when a search is saved on the server
- python strings can be uploaded and saved just like files

* Bug fixes including
- improved unicode support for uploaded files
- solved cache issue on Windows
- a major bug in the Collection.where method

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* Errors following the PEP-249

* Some operations follow the PEP-249 - e.g. `fetchall` replaces `get`

* New inspection functions:
- experiement_types
- assessor_types
- scan_types
- reconstruction_types
- project_values
- subject_values
- experiment_values
- assessor_values
- scan_values
- reconstruction_values

* Inspect method `fieldvalues` changed to `field_values`

* `Interface` Object now supports config files.

* Bug fix regarding the file names in the cache. It means that cached data
from older versions has to be re-downloaded.

* The disk check for available space is performed against a timer instead
of always.

* The default `get` function to download file now supports custom paths.

* Bug fix for HTTP sessions management.

* New `last_modified` method for project to get subjects last modified
date.

* Resource elements are now fully configurable at creation.

* Added support for XNAT pipelines.

* Added push and pull zip files at the resource level.

* Added simple schema parsing capabilities.

* Add a global management interface to gather different managers.

* Interface now follows redirections on the server url.