Added walrus and sc utilities for querying info directly from DBs and unexporting volumes
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Update README.md
Added requirements section to the readme
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Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Updated, added requirement for euca 3.3.0
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Merge pull request #2 from zhill/master

Added query-sc, query-walrus, and unexport-volume