removing species NA
adding before-we-start lesson
adding files from iDigBio lesson
adding Makefile to generate html and skeleton files
Proofread, fixed image path
Really fixed image path
Proofread, fixed image paths for lesson 01
Cleaned and edited text, fixed image paths for lesson 02
Edited text, added links for lesson 03
Minor edits in lesson 04
Minor edits, checked links in lesson 05
Minor edits, checked links in lesson 06
Update 01-starting-with-data.md

just checking out this repo and fixed a tiny typo
Merge pull request #91 from therewasaguy/patch-1

Fixes typo in 01-starting-with-data.md
remove mentions of GUID in data presentation
Revert "removing species NA"

This reverts commit ae01c42f81a50abd262af4691966d0e81b7600d3.

Return to original data files.
Merge pull request #92 from leogargu/master

Excel lessons clean up: proofreading, editing, image paths updated, links checked
rename species NA -> NL

In this commit, I moved the original dataset into a subfolder (`data_orig/`). I
wrote a simple R script that renames the species from NA to NL (and some limited
tests comparing the original and the new datasets). The modified dataset is
written where it was originally.

There are few other changes to the files that shouldn't impact anything else:
- the headers are now quoted
- columns that only contain numbers are not quoted

I have no problem to have this script (or other variation posted on figshare or
wherever Morgan would prefer).
rewrite lesson
remove unnecessary pdf file