Use latest messytables
Hopefully fix travis
Merge pull request #90 from okfn/upgrade-messytables

Use latest messytables
[#78,csv][s]: use unicodecsv in CSV writing so we can support unicode - fixes #78.
[#91][m]: extract cli code to make generic dataconvert convenience method - fixes #91.

* Add example to documentation and refactor docs quite a bit.
[docs][s]: merge existing tools into main page.
[theme][s]: switch to default theme.