telefonicaid/fiware-orion — pull request #469 by kzangeli (2014-07-25 11:15:41+00:00)
Title: Bug/38 context value not mandatory

### Description
ContextAttribute::contextValue is not MANDATORY in FI-WARE NGSI, only in OMA NGSI.
This is fixed in this short PR. Issue #38 can be closed after merging this PR.