CLIMATE-370 - Add conda dependencies file

- Add ocw-conda-dependencies to simply conda install of OCW
  dependencies. Any packages that should be conda installed can be listed
  here and they will be picked up by the install scripts (assuming they
  use this file).
CLIMATE-370 - Add OS X install script

- Add OS X helper install script. Note that this uses the conda
  dependencies file for installation of some of the components. At the
  moment, specific versions aren't grabbed (just the latest versions of
  the components are).
CLIMATE-370 - Add Ubuntu 12.04 helper install script

- Add Ubuntu 12.04 helper install script. Due to a problem encountered
  using conda to install dependencies, the Anaconda Python distribution
  is used instead. For the most part, this just means that additional
  dependencies that aren't 100% necessary are downloaded as well.
- The Anaconda distribution that is used needs to be "versioned" at some
  level to ensure that new versions of the libraries don't break toolkit
  functionality.
- Further testing needs to be done to make the conda install work so
  that there is minimal difference between the OS X and Ubuntu install
  scripts.
CLIMATE-370 - Remove old easy-ocw Buildout code
Resolve CLIMATE-370. Merge PR #29