First commit: adds README
Adds .gitignore to project
Adds requirements file to project
First commit with some initial work about crawler

- Fetching data about the agency and the routes
- API Key validation and error handling
- Sensitive information retrieved from environment
variables
- Attempting to have simple and idiomatic code
Adds some FiWare constants and changes exceptions:

- FIWARE Host (Public IP) and Good status (JSON) 
are now constants;
- Exceptions now have __str__ methods so they can 
be logged when errors occur.
Updates OST data retrieval and FiWare insertion:

- Agency, Routes and Trips are now inserted into 
FiWare's Orion ContextBroker
- Several generic methods were developed to help 
the data parsing, data insertion, and data testing
Enhances the code a little bit with more Constants
Splits the utils.py in 2 files and edits + stuff:

- Now there's a file for the OST APIs crawler
(crawler.py)...
- ...and a file for the Orion's ContextBroker data 
insertion (importer.py)
- Replaces relative imports with regular imports
- Some refactoring and more constants
Bugfix on importing stoptimes + Remove debug print
Adds RabbitMQ credentials to contants.py
Enhances the debug print messages
Updates the README and adds the celeryconfig
Small updates to the README
Updates README, refactors code and adds tests
Merges GitHub changes (README and .gitignore)