Adding new Selectors
Merge branch 'future/0.1.0' of github.com:Stratio/stratio-meta into future/0.1.0
Rework Selector grammar on Select.
Merge branch 'future/0.1.0' of github.com:Stratio/stratio-meta into future/0.1.0

Conflicts:
	meta-core/src/test/java/com/stratio/meta/core/grammar/ParsingTest.java