Issue #2299361 by trgreen17, wadmiraal, naveenvalecha, er.pushpinderrana, neetu morwani, jhodgdon, joachim: description of drupalGetTestFiles() is vague and has a typo; simpletest_generate_file() needs help too

Issue #2512210 by trgreen17, jhodgdon, liberatr: SimpleTest - WebTestBase method creates binary-text files when the intention was to create text files, and text file creation is broken