matplotlib Code

Workbook: Add bessel examples, and jpg I forgot to commit before.

More cleanups and updates to workbook

Major updates to workbook.

- Made the basemap figures smaller (they were too big and made the
compilation really slow).

- Changed the ratner figure from png to jpb (saved 90% in size)

- Removed all lyx files, we're now using pure latex.

- Added scripts for various useful tasks.

Commits to continue the merged book.

remove pdf files

use 600 dpi pngs instead of eps/pdf for basemap example
(eps/pdf files were too big)

update figs for basemap example

update basemap example

add 'Plotting on Maps' chapter

added lotka volterra skeleton to workbook