API endpoints for measurements, sensors

[oscgonfer]

Add endpoints for the creation or modification of the parts of the data model:

• ~Kits~
• Measurements
• Sensors

This would allow an easier creation of new items in those tables. The implementation for adding the components (not listed above) to the kit needs to also be reviewed.

[oscgonfer]

Review #181

[timcowlishaw]

I think this is already done, but perhaps not documented - @oscgonfer to confirm!

[oscgonfer]

Simply not documented then!