Auto-detect TSV files with .CSV extensions
Merge remote-tracking branch 'origin/master' into tsv-detect

Conflicts:
	tests/FSharp.Data.Tests/CsvProvider.fs
Refactor TSV auto-detect to be less clumsy
Use Contains() instead of IndexOf()
Merge remote-tracking branch 'taylorwood/tsv-detect'
Update release notes + cleanup CsvRuntime