Birdhousebuilder.recipe.thredds

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* install tomcat.

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* remove config files on uninstall.

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* using tomcat.content_root().
* cleaned up default configs for thredds.
* allow more configurations.

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* updated docs.

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* installing in conda enviroment ``birdhouse``.
* using ``$ANACONDA_HOME`` environment variable.
* separation of anaconda-home and installation prefix.

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* Don't update conda on buildout update.