Trying to fix Travis CI
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/dbpedia/extraction-framework
Merge branch 'master' of https://github.com/dbpedia/extraction-framework
Sync travis file
Merge branch 'master' of https://github.com/dbpedia/extraction-framework
Merge branch 'master' of https://github.com/dbpedia/extraction-framework
Merge branch 'master' of https://github.com/dbpedia/extraction-framework
Merge branch 'master' of https://github.com/ninniuz/extraction-framework
Reject too long predicates.

Implemented an extension of the UriPolicy which rejects predicates which length > 512 chars.
The UriPolicy property is called "validate-uri-length" and only accepts "-predicates" as suffix.

Fix for #29
Merge pull request #42 from ninniuz/29_big_prop

Reject long predicates