Merge pull request #1 from ioos/master

Update README.md to reflect dataset loader, updates #63
Update README.md
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Conflicts:
	README.md

Merging ioos/master. Merges lines in README.md regarding installation on Ubuntu and MS-Windows. Adds Ubuntu installation file.
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Change subheading level
Update README.md

s/available/unavailable/
Merge remote-tracking branch 'upstream/master'
Merge pull request #64 from duncombe/master

README text about installation on Windows OS