matplotlib Code

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.

minor tweaks to pyrex

updated pyrex workbook

Reorganize a bit. Waste 2 hours dealing with utf-8 problems with latex...

Update reST in requirements doc

Commits to continue the merged book.

add 'Plotting on Maps' chapter

added lotka volterra skeleton to workbook

added andy

added stats workbooks skel