Return result of type inference from HtmlInference.inferHeaders, don't infer types twice.
Add test to ensure units are parsed from HTML table headers
Add test to ensure units are parsed from HTML table inferred headers
Fix unit parsing in HtmlInference.inferHeaders optimization and pass preferOptionals from callers
Fix typos in tutorial
Fix some wordings in CsvProvider tutorial
Fix grammatical issues in Freebase tutorial
Fix typos in Http tutorial
Improve wording in JsonProvider tutorial
Fix typos in JsonValue tutorial
Improve wording in WorldBank tutorial
Fix grammatical issues in XmlProvider tutorial
Merge pull request #720 from taylorwood/master

Proofreading tutorial docs
Merge branch 'HtmlTypeInfer'