added besancon reader (originally written for astropy; depends on
astropy)
included besancon reader test in test_besancon
added asciitable to travis (besancon still depends on it)
bugfix; had an erroneous and extraneous line
import besancon reader correctly
moved around .txt file for besancon test; for some reason it can't find
the file?!
Merge pull request #34 from keflavich/besancon_reader

Besancon reader
(required for tests, so I'm going to merge it and deal with errors later)
Fix and format code example in README
Fix errors and warnings pointed out by Eclipse PyDev code analysis

Mostly unused imports and variables, non-standard indentation.
Some real errors.
Should be clear what the problem was from the diff.