v.0.2.0

Update on Database Migration:

• Rename Molecule_data table to Molecules
• New molecule_rel_data table storing molecules ID and Package ID

Update on Database Models:

• Created two models scripts and class for each table above.
• class methods for insert and retrieving data via models without pscogy usage

Update on Controllers:

• Extension controllers now retrieves data through models rather than manual SQL queries. Giving us more privacy and faster interaction with PSQL.