Upgrading NxParser version to 1.2.3

This pull request upgrades the version of the NxParser from 1.1 to 1.2.3 (most recent at this date). The changes affect two modules, core and eval.

- Root directory changes:
  - Adds a dependency for httpmime version 4.3.1 (latest)

- Module core changes:
  - Changes class SparqlQueryExecuter.java

- Module eval changes:
  - Changes classes AnnotationClient.java, ExtractivClient.java, HeadUpClient.java, OntosClient.java, OpenCalaisClient.java, WikiMachineClient.java and WMWikifyClient.java
  - Adds a dependency to the pom.xml file (same from the Spotlight.xml pom file)