Add stream tapping with tests

Add stream tapping example
Improve example docstring
Fix PEP-8 issue

Add docstrings for example info getters
Increment version
Merge pull request #32 from johnwlockwood/mp-flow-pipes

Introducing Stream Tapping
Rename things in tap.

Makes the wording more consistent with
tapping metaphor.
Add simpler tap example with entry in getting started.
Merge pull request #33 from johnwlockwood/development

Finalize 0.2.8 with Tap