Added call to manager.main() in README.

When I tried the example it didn't work unless I've added the call to `manager.main()`. Unless it's a bug, I guess it's better to update the README.
Update README.rst
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
Merge pull request #4 from arikfr/patch-1

Added call to manager.main() in README.
Renames manage into manager
Fixes tests that import from manager
Fixes README code sample
Fixes manage console script
Adds Error exception
Adds CommandTest.test_puts_error()
Merge branch 'master' of github.com:Birdback/manage.py
Fixes exceptions style