Initial reformatting of sections 4 and 5 into a single section
Drops special characters from the kolwalczyk2011 reference
Add Hickham ref and update info of Palmer ref
Add Hamilton 2013 citation information. Fix formatting mistakes in Palmer 2004
Minor polishing edits to the combinined section of data format and structure
Fix formating mistake in Wickham 2007
Minor edits to the Share your data section
Merge pull request #34 from dmcglinn/master

Merged Data format and Data sturcture sections into one. Minor edits in share your data section