add tex version of vignette to repository
Merge remote-tracking branch 'upstream/master'
merge mr alvord's changes related to latex vignette
remove old latex version of vignette
Merge remote-tracking branch 'upstream/master'
fixed typo in sla documentation
fix issue that was causing plot to return NULL
add todo to readme
Merge pull request #4 from ncarchedi/master

Bring Mr. Alvord up to speed with my changes