Serialization of Period class.
Add order in period serialization.
Merge pull request #98 from adrian-rosello/feature/period-serialization

Feature/period serialization
API publishes capability proxies.

This way, every call to the API is executed as a Service in the execution Service (by using the proxy).
This is the way they are meant to be axecuted.

This way, observations are appropiatedly triggered, resulting in platform desired behaviour.
Merge pull request #99 from isartcanyameres/fix/api-publishes-proxies

API publishes capability proxies.
Merge branch 'master' of https://github.com/dana-i2cat/mqnaas

Conflicts:
	extensions/pom.xml