ENH: Add support error message

Granted that qcli is updated to version 0.1.1, error messages in QIIME will no
longer print the script usage text (also known as the wall of text), instead
only the error message and a small string with a URL where users can find
support will be printed, see this example:

(qiime-dev)yoshikivazquezbaeza:qiime@extra-help$ print_qiime_config.py
--does-not-exist Error in print_qiime_config.py: no such option: --does-not-exit

If you need help with QIIME, see: http://help.qiime.org

Note that we don't "have" to update setup.py to require qcli==0.1.1, because
0.1.0 will work just fine, the only problem is that the wall of text will
continue to be printed.

For more info see this PR: https://github.com/biocore/pyqi/pull/265

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Note that this is not ready to be merged, I heard that help.qiime.org was
working but I couldn't get it to redirect to the wiki page that @gregcaporaso
prepared.