First unit test for studentData

Added local PHPUnit framework, test class for studentData and
first test.
Unit tests for studentData
Rough skeleton of student query
Configure your own file storage path.
Successfully queries database.

One unit test (out of 2) passes.
All student data tests pass
Added error logging to studentData
Adding config changes to the example file.
Merge branch 'fb5034-QueryStudentData' of https://github.com/shawn-bellevuecollege/gravityforms-external-data-fields into shawn-bellevuecollege-fb5034-QueryStudentData
Merge branch 'shawn-bellevuecollege-fb5034-QueryStudentData' into dev

Conflicts:
	gravityforms-external-data-fields/EXAMPLE-gravityforms-external-data-fields-config.php
Replaced user-specific settings w/ generic domain & folders.
Added troubleshooting output
Added phone # fields to student query
Refactored to lookup student from username

Class now takes a user login instead of a SID and uses that to query
the rest of student data.
Added IsStudent() functions
Updated config example
Coded CAS authentication

Unfortunately, the CAS client code runs too late in the WordPress
page load process and we're getting an error that HTTP headers (to do
 the redirect) can't be written to because content writing has
 already started. I'm currently troubleshooting this.
Login via CAS is now working

fogbugz:5062
Implemented requireAuthentication as a PHP class, currently using
CAS for SSO authentication. This is a rough, working implementation
that needs polishing, better error handling, etc.
Added enableDebug flag

Primarily for enabling CAS debugging.
Merge pull request #9 from shawn-bellevuecollege/fb5061-FinalStudentQuery

Retrieve student data and isStudent() check