added new constants for Service Tax and Online Fee Commission
added the end time for a course schedule
change in session parameters
added a new library that is used to send email
added comments to the ccavenue_payment library
changes done for the new communication library to send email
links on the left menu changed, change in available course table, top links changed
removed the font family from the couses offered heading in left menu
added new styles for the online courses section
added fonts
handled the service tax and online fee on selected course