Fixes 'data is' to 'data are' in all areas where appropriate.
Merge pull request #104 from embaldridge/master

Fixes the 'data is' problem.
Adds names of Excel file types to manuscript.
Merge pull request #105 from embaldridge/master

Clarify that "Excel format" means .xls and .xlsx
Changed 'Figshare' to 'figshare'.
Merge pull request #106 from embaldridge/master

Fixes figshare capitalization problem.