Allow conversion of named tab for xlsx files
Add --sheet option to in2csv for XLSX files
add --sheet option support for XLS
Add Chris Rosenthal to AUTHORS.
fix tests for win32

change requirements to be more lenient
Fixed a few typos.
Merge pull request #198 from vad/patch-1

Fixed a few typos in the docs.
Update AUTHORS
Merge branch 'master' of https://github.com/mindw/csvkit
add --sheet to docs
add tests for --sheet option on in2csv
Add Gabi Davar to AUTHORS.
Merge branch 'master' of https://github.com/jpmckinney/csvkit
add examples for new --sheet tests
Merge branch 'master' of https://github.com/jpmckinney/csvkit
Add Sriram Karra and James McKinney to AUTHORS.
Update copyright year