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
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