argparse is defined as a requirement only for python versions < 2.7
Update csvjoin.rst

Added an example for csvjoin.rst
csvlook.  Added logic to add default headers and to allow --linenumbers option to add line numbers.
csvlook.  Added default column names and working --linenumber option.  Minor mod.
Changed csvlook test to match new output.
Fixed Travis CI link

Moved to https and removed the hash hack characters (#!) which are no longer needed.
Very minor sql2csv cleanup.
Add docs for sql2csv.
Add SQL calculator example.
Added sql2csv reference to index.
Validate database connections before loading large files. Closes #257.
Update with note about Python headers. Closes #249.
Clarify the docs for --escapechar. Closes #242.
Update CHANGELOG.
Update copyright date.
Make csvkit API compatible with CSV.
Merge pull request #258 from zyegfryed/patch-1

Fixed Travis CI link
Add Sébastien Fievet to AUTHORS.
Update CHANGELOG.
Tweak SQLAlchemy dep spec. Closes #237.