improve and optimization find methods in Environment and AbstractEnvironments
remove not used methods
add unit test
ADD nid test cases
Merge pull request #128 from jframos/QA/nids

ADD nid test cases
Merge pull request #125 from jesuspg/bug/4393_heap_optimize

improve and optimization find methods in Environment and AbstractEnviron...
Merge branch 'develop' of github.com:telefonicaid/fiware-paas into QA/update_environment
FIX dataset