CLIMATE-430 - Add wiki doc link to easy-ocw install scripts
CLIMATE-440 - Remove local PATH_LEADER settings in directory_helpers

- Remove all local copies of PATH_LEADER in test_directory_helpers. Now
  the settings in the backend config are used instead.
- Move PATH_LEADER creation to the test package wide setup function.
  Remove the explicit removes present in test_directory_helpers.
- Remove hardcoded WORK_DIR value in package wide setup function. Now
  the value set in config is used instead.
Resolve CLIMATE-440. Merge PR #38.
CLIMATE-442 - Switch mkdirs to makedirs in test package setup
Resolve CLIMATE-442. Merge PR #39.
Resolve CLIMATE-430. Merge PR #36.
CLIMATE-439 Added calc_climatology_year function
CLIMATE-429 - Add sphinx dependencies to easy-ocw
Resolve 'CLIMATE-429' merge PR #40
CLIMATE-445 - Remove code checkout from easy-ocw Ubuntu install
Resolve CLIMATE-445. Merge PR #41.
CLIMATE-446 - Use archive link for Anaconda download
Resolve CLIMATE-446. Merge PR #42.
CLIMATE-443 - Add metrics.SpatialStdDevRatio metric and tests

- Metric includes the calcClimYear function from RCMET. Waiting
for CLIMATE-439 to complete.
CLIMATE-439 unittest for calc_climatology_year in utils.py
Merge branch 'CLIMATE-438', Merge PR #44, Resolve 'CLIMATE-439'.
Resolve CLIMATE-443. Merge PR #43
CLIMATE-447 - Add __init__.py to ocw.tests
Resolve CLIMATE-447. Merge PR #46.