[UPDATE] added a new readAcknowledge notifier
Merge branch 'master' of https://github.com/it4energy/smartcampusapi
[NEW] Adds the metadata object builder other documentation enhancements.
Merge branch 'master' of https://github.com/it4energy/smartcampusapi

Conflicts:
	eu.smartcampus.api/src/eu/smartcampus/api/AbstractDeviceConnectivityAPI.java
	eu.smartcampus.api/src/eu/smartcampus/util/Metadata.java