Port the code for Python 2.7

[rishy]

Presently, all of our codebase is complaint with Python3.5. Although, there's a high probability that a lot of people might have to use it with Python2.7.

Create a separate branch for this, so that we can also have options to provide two different versions for the textbrew(2.7 and 3.5).

Maybe you can use, something like https://pypi.python.org/pypi/3to2.

[igagansingh]

Hi @rishy I've tried to solve the portability issue.
https://github.com/igagansingh/textbrew/tree/backport_py27_port
Have created it in a different branch as given in the instruction, if anyone could please check it on their system with python2 it would be great.

[rishy]

@igagansingh feel free to send a PR for the same.