Fixed a handful of typos
Merge pull request #278 from alex/fix-typos

Fixed a handful of typos
defer closing body
Merge pull request #280 from jrperritt/close-readcloser

defer closing body
ExtractErrResult -> ErrResult; Extract -> ExtractErr
Merge branch 'master' of https://github.com/rackspace/gophercloud into ExtractHeader-method