Added test case details and steps in the header section of each Test
Case class file. Also, comments some invalid and valid email address in
the input files, for which the test case should ideally pass (i.e.
should invalid email message for invalid addresses and accept valid
email addresses).
Committed some of the invalid and valid email addresses, which are
expected to pass,but are failing. 
Made some changes in the testng.xml file with browser values.
Set the expectedtime to 4500 in the
VerifyBasicPerformanceOfContactUsForm.java