Birdhousebuilder-recipe-conda

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* using ``CONDA_PREFIX``.

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* added option no-pin and override-channels.
* sets conda env-path and prefix in options.
* enabled travis build.
* removed unused as_bool and makedirs functions.
* using bool_option from zc.buildout.
* using conda offline mode.
* install pip packages.
* added prefix option.
* using ``CONDA_ENV_PATH``.

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* removed default ioos conda channel.

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* added default ioos conda channel.

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* use buildout offline option ... don't establish internet connection when enabled.

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* use CONDA_ENVS_DIR to overwrite base dir of conda environments.