re-removed experiments() from select class.
Merge branch 'master' of https://github.com/pyxnat/pyxnat
added UnauthInterface class
Merge branch 'master' of https://github.com/pyxnat/pyxnat
basic unauthenticated interface tests
rolling class UnauthInterface into Interface(anonymous=True)
documentation
added File.last_modified()
Merge pull request #16 from chaselgrove/master

File.last_modified()
str(exception) instead of exception.message to avoid "deprecated as of Python 2.6" warning
Merge pull request #17 from chaselgrove/master

Exception.message deprecated
Updated the example file.
Merge branch 'master' of github.com:pyxnat/pyxnat
fixed typo in and added test for File.last_modified()
added support for file hierarchies
Merge pull request #18 from chaselgrove/master

Fixed bug in File.last_modified()
using _connect_extras in Interface._get_head()
Merge branch 'master' of https://github.com/pyxnat/pyxnat
Fixed subject_label in array.scans search so that it always selectes from xnat:subjectData which is where subject label exists.
fixing [In|Out]_Resource.parent()
fixing [In|Out]_Resource.parent()