v0.1.0 Logging bot

This pull request adds the following features
1. Base architecture for the project. Find more details in the wiki page on [architecture](https://github.com/pesos/optimus/wiki/Architecture)
2. Adds a few adapters and libraries to be used in the future (Ex: [ElasticSearch](http://www.elasticsearch.org/) and turk.js)
3. Adds a logger bot that stores every message in files and retrieves the last n messages when queried with the syntax ```!logs <number>``` or ```!log <number>```
4. Logs are stored on a regularly; ie, by default, each month's logs go to a separate file. Implemented using a scheduling library