Remove out-of-date PDF
update lattice lecture
Worked on lecture 1 and moved content from the intro to the probability one.
Add README for Principles lecture
Add MAACS environmental data for bigger example
Update lattice lecture
Rename directory to remove space
Remove space from directory name
Reorganize a little
Break slides into separate files
Merge pull request #29 from bcaffo/master

Worked on lecture 1 and moved content from the intro to the probability ...
Merge pull request #30 from rdpeng/plotting

Plotting
First big update to prediction
Merge pull request #31 from jtleek/jeff

First big update to prediction