Change the Python class format to new-style.
Style code pythonic
Remove verbose ` is True`
Resolve conflict.
Add a dummy twitter_conf.yaml.
Use `with` statement on file open
Merge pull request #2 from 1024jp/refactor/with

Commit merged: Use `with` statement on file open
Update to take Twitter APIs from config YAML file.
Use csv module for example
Update methods to use YAML file name, given by main (instead of constant value -- goofy me!)
Merge pull request #3 from 1024jp/refactor/csv

Accepted: Use csv module for example
Repalce delimiter, instead of delimitter (typo)
Trim a dummy API-key entries -- they need to be obtained from YAML file..
Moved import yaml to 3rd-party section.
Update the script to read Twitter API keys from external YAML file.
Change i variable to more meaningful name -- one should not use i or j for non-iterator.
Change RT message (very trivial).
Use `print` function instead of `print` statement
Merge pull request #4 from 1024jp/refactor/print

Accepted: Use `print` function instead of `print` statement
Add a new python file called train.py, which is to train the model, and removed the relevant lines for training in the naive_bayes_retweet.py.