v1_beta20 - 07/06/2016

Changelog:

• Lots of changes on C API, leading to a more uniform interface across all different parts (I/O, communication protocols, ...)
• Node types related to robotics were added
• A couple tools were created to help debugging I/O (sol-aio and sol-gpio)
• Many samples for Nodejs bindings were merged
• Support to node type aliases
• Improvements on sol-oic-gen to better support OCF data models
• Introduced sol-bluetooth and sol-gatt API
• Support HTTPS on http-server
• Zephyr IPM (mailbox) support
• Implement persistence for Zephyr
• Connections management support (sol-netctl)
• LWM2M bootstrap interface implemented
• Tons of new tests, samples and fixes