Adds ManagerTest.test_parse_env_simple
Adds ManagerTest.test_parse_env_quote
Adds ManagerTest.test_parse_env_double_quote
Adds ManagerTest.test_parse_env_multiline
Adds Manager.parse_env
Improves Manager that now update environment from .env file if present
Merge branch 'env_files'
Adds a note about .env file
Bumps 0.1b4