[docs] [issue14097] Improve the "introduction" page of the tutorial

[Zachary Ware]

Zachary Ware added the comment:

How's this for a 2.7 backport?  The least direct part of the backport is the section on division; I pretty much had to completely rewrite the paragraph in 2.x terms and I'm not certain that I took the best approach.

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stage: commit review -> patch review
versions:  -Python 3.3, Python 3.4
Added file: http://bugs.python.org/file35414/issue14097-2.7.diff

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