STANBOL-488: Updated EnhancementEngineHelper#getEnhancementProperties(..) to not fail if no ExecutionMetadata are present

git-svn-id: https://svn.apache.org/repos/asf/stanbol/branches/release-0.12@1593899 13f79535-47bb-0310-9956-ffa450edef68
fix for STANBOL-1339: charset is now appended to the Content-Type header when serializing RDF; STANBOL-1340: application/ld+json is now used as Content-Type for JSON-LD serialied RDF data; also updated integration tests to test both changes

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STANBOL-488, STANBOL-1287: Add integration test for request scoped enhancement properties using the support of the Dereference Engine

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STANBOL-488: all methods, utilities and variables dealing with request scoped EnhancementProperties now use request properties in their name. This allows a better distinguish between properties as parsed with request (using the '[{engine-name}:]{key}' encoding for keys) and EnhancementProperties as extracted for the current engine. This introduces no functional changes

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implementation of STANBOL-1247: The module of the Entityhub Sesame Yard now has a SesameYardComponent that allows to configure a SesameYard for a SesameRepository registered as OSGI service

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STANBOL-1245: commons.marmotta.kiwi is an OSGI Bundle for the Marmotta Kiwi Triplestore that also provides a OSGI Component to configure Kiwi TripleStore instances. The launchers.bundlelists.marmotta.kiwi module provides a bundlelist with all the dependencies required for the Kiwi Triplestore. Dependencies for some supported DBs and Caching options are commented

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STANBOL-1169 and STANBOL-1245: added license headers and some other minor corrections

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implementation for STANBOL-660: The Content-Language header can now be used to parse the language of the posted content; STANBOL-488: added Configuration Utilities to the EnhancementEngineHelper; changed some inconsistent names found while writing the documentation; added missing configuration properties to the WeightedChain and GraphChain; added EnhancementProperties namespace to the Stanbol mappings in the NamespacePrefixService; corrected the prefix of the namespace in the NamespaceEnum to the same as used in the documentation

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