logger module refactor

[opalmer]

Refactor pyfarm.core.logger fix some inconsistencies and reduce the amount of custom setup we're doing by default. This should include:

• Migration to dictConfig to simplify configuration. This should probably should read a configuration dict either from the environment or from a json path in an environment variable.
• Warning message redirection
• Minimal root logger setup in logger.py (should be handled by loggerDict)
• logger.getLogger should only append PyFarm's root logger name: pyfarm
• colorized log formatting (again, dictConfig should set this up)