Added step to encode strings using Base64.
Added a bunch of steps, related to JSON Pointer.
GH #4 - Added a few steps related to SQL db.
GH #4 - Added unit tests to steps related to SQL.
GH #4 - Added sqlalchemy and psycopg2 to requirements.txt.
GH #4 - Refactored line that exceeded 130 characters.
GH #4 - Refactored common steps out of SQL ones.