Release v0.3

[ThibaultMarzullo]

Preparation for the v0.3 release.

Features:

• Add multi-building simulation, Issue #35
• Add support for multiple metamodels per case, Issue #28

Documentation:
Issue #31

• Update all README.md files
• Add Gym documentation
• Publish the Wiki in place of the PDF manual

Examples:

• Add tutorials to the Wiki, Issue #32
• Fix the single-zone examples, Issue #28
• Add multi-building MPC
• Add IAQ MPC
• Update RL examples, Issue #34

Test cases:

• Update SOM3 to support CO2 contaminant modelling and sensing, Issue #30
• Add variations of the SOM3 model for multi-building and for RL transfer learning