Remove unrelated files
Remove Twitter4C
General cleanup for the collector

- Renamed directory Twitter4J to collector
- Add symlink to the jar file
- Remove unrelated files
- Rename library jar files
Rewrite .gitignore file
Makefile: Add rules for frontend and backend

The 'ringonly' target was also added. This target will build everything
but the frontend and the backend.
Add missing java source files for the collector
Makefile: Fix frontend and backend build issues
added c code to extract number of followers from file

also added header in case we want to use it later