Added dryrun option
Added customer & category dryrun
Update README.markdown

Amazing new features should be documented...
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more details about error retrieval
Merge pull request #39 from amenk/patch-1

Update README.markdown
Merge pull request #38 from ho-nl/upstream/dryrun

Added dryrun option, only check for errors and return the errors.
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Added wiki link
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Merge branch 'refs/heads/ignore-duplicates'

* refs/heads/ignore-duplicates:
  Update README.markdown
  Update README.markdown
  Update README.markdown
  Update README.markdown
  Added customer & category dryrun
  Added dryrun option

Conflicts:
	README.markdown