Python3 upgrade and a new feature to eliminate three types of python comments (1. # 2. """comment""", and 3. '''comment''' )

[maldil]

I upgraded the python version of all the python files. I ran the test cases in tokenizer-unit-test.py. All test cases are working. I worked on file level tokenizer ('zip') and controller.py after the upgrade.
Changes

1. changes for print statement
2. Python3 zip() returns an iterator object. Since we want to iterate more than once, zip object is converted to a list to.
3. Removed unused import statements.
4. Python supports three ways of adding comments. 1. """ """ 2. ''' ''' 3. # . Therefore, I added another feature to specify "second_comment_open_tag".

Feel free to contact me if you need any further changes. Thanks.