Providing a way to specify the executor to use while constructing the DAG object

adding host=0.0.0.0 to ensure the service is accesible from outside localhost

Revert "adding host=0.0.0.0 to ensure the service is accesible from outside localhost"

This reverts commit ce5436bc7dcd70dcb129c1dfa46f9fd7ce743e43.
Merge pull request #3 from mistercrunch/executor_fix

Providing a way to specify the executor to use while constructing the DAG object
integrating config parser to read config values from a file
Addressed the comments on shorter import and space in configuration.py
adding a sed comand to replace airflow_home automatically in default airflow.cfg
Merge pull request #4 from mistercrunch/config_parser

integrating config parser to read config values from a file
Minor tuneupts