Enable multiple Python Support

[alshapton]

Prerequisites

• [ Yes] Can you reproduce the problem?
• [ Yes] Are you running the compatible versions of TinyDB and TinyMP?

Do you feel this is an issue with TinyDB or TinyMP? -Done TinyMP
If it is with TinyDB, then please consider checking the TinyDB forums first - Done

For more information, see the CONTRIBUTING guide.

Description

Amend Travis-CI to ensure that multiple Python versions are tested and supported

Versions

Please state the versions of TinyDB and TinyMP you are using: 3.7.0 (tdb) 0.2.0 (tmp)

[alshapton]

https://docs.python.org/2/library/2to3.html

[alshapton]

Would need to make the Python 2.7 installable as a PIP package to ensure that Python 3 will work in the same way. There is nothing fundamental that stops this working in Python 3.x as well with no change

https://python-packaging.readthedocs.io/en/latest/minimal.html

[alshapton]

http://python-future.org/automatic_conversion.html

[alshapton]

https://stackoverflow.com/questions/32658058/difference-between-importing-module-in-python-3-4-and-python-2-7

Believe that the modifyscripts.sh script needs to use "from future import absolute_import" as well as using "from . tinymp import *" (note the dot) where the prependation is taking place.