Initial NPM release

There are multiple changes from the previous v0.0.1 release (including JWT and HTTPS authentication, status checks, various bugfixes, etc.). This should be viewed as the first "stable" or "public" version.

First release

Basic nodes for LwM2M REST API:

• Generic LwM2M request node
• Nodes for 8dev_3700, 8dev_3800, 8dev_4400 and 8dev_4500 boards
• Legacy nodes