Remove repeated wrappers for Slices and units. Comment nitos related info in test.
Create exception for network release failures.
Request wrapper methods no longer launch CapabilityNotFoundException.
NetworkManagement.releaseNetwork remove slice resources.
NetworkManagement.releaseNetwork aware of subnetworks.
Added IAttributeStore and its implementation
Removed Exception
Cosmetic changes only
Added capability wrappers
Merge pull request #135 from shummi/master

Added AttributeStore and Slice capability wrappers
Merge branch 'master' of https://github.com/dana-i2cat/mqnaas into fix/remove-repeated-wrapper

Conflicts:
	extensions/network/network.impl/src/main/java/org/mqnaas/network/impl/Network.java
	extensions/network/network.impl/src/main/java/org/mqnaas/network/impl/NetworkManagement.java
Merge pull request #132 from adrian-rosello/fix/remove-repeated-wrapper

Remove repeated wrappers for Slices and units. Comment nitos related info in test
Merge branch 'master' of https://github.com/dana-i2cat/mqnaas into feature/release-network

Conflicts:
	extensions/network/network.impl/src/main/java/org/mqnaas/network/impl/Network.java
	extensions/network/network.impl/src/main/java/org/mqnaas/network/impl/NetworkManagement.java
	extensions/network/network.impl/src/main/java/org/mqnaas/network/impl/request/Request.java
Merge pull request #134 from adrian-rosello/feature/release-network

Feature/release network
Merge branch 'master' of https://github.com/dana-i2cat/mqnaas into api/improvements

Conflicts:
	core/src/main/java/org/mqnaas/core/impl/slicing/Slice.java
	extensions/network/itests/src/test/java/org/mqnaas/extensions/network/itests/NetworkManagementTest.java
	extensions/network/network.impl/src/main/java/org/mqnaas/network/impl/Slice.java