[gitignore][xs]: .
[#78,commas][s]: new write method.
[#73,jsondata][s]: new jsondata module with a write method for writing to json.
[#65,cli][m]: start of a command line interface.
[#65,cli][s]: install an actual command (dataconvert) for our cli using setuptools console_scripts entry point.
[#65,doc][s]: update README with documentation of cli and a bit of general tidying.
[setup.py][xs]: tidy up for posting on pypi.

* install_requires includes messytables
* version set to 0.2
[doc][s]: add info on install from pypi and refactor a bit.