Update sarpy Patient class to be more selective about patient names

[firasm]

currently, if you say sarpy.Patient('HerS1'), it will take all patients that have the starting HerS1,rather than just the HerS1 studies.

[firasm]

This actually isn't really an issue because you can restrict the names more specifically.

See here for details:

http://pymotw.com/2/glob/

One example of where this could be a problem is:

import sarpy
e = sarpy.Experiment('HPGS1')

This will get you HPGS1 and HPGS13:

• HPGS1H01.3B1
• HPGS1T01.3C1

• HPGS13testMouse.sV1

  if you want just the HPGS1 studies, here's what to do:

e = sarpy.Experiment('HPGS1[A-Za-z]')

This will result in the following studies:

• HPGS1H01.3B1
• HPGS1T01.3C1