Mongo connection global integration

[cuquiwi]

Create a module that unifies our method of connecting to Mongo

[cuquiwi]

Created module to abstract the connection to Mongo. But the way to install and import this module is "hacky". We need to create a setup/installation file to import this in an elegant way

[Oliph]

• [x] Implementation in keyword_processor.py
• [x] Implementation in api_google
• [x] Implementation in api_maldita
• [x] Implementation in meneame
• [x] Implementation in poligrafo
• [x] Implementation in telegram
• [x] Implementation in twitter

[cuquiwi]

Should be solved by #15