Loads of changes!

* Added conversion plugins (API might change!)
* Added conversion to the analysis pipeline
* Changed behaviour of --default-plugins (it adds conversion plugins regardless)
* Added emotionModel [sic] and emotionConversion models

//TODO add conversion tests
//TODO add conversion to docs

requirements.txt

@@ -1,7 +1,5 @@
 Flask>=0.10.1
-gunicorn>=19.0.0
 requests>=2.4.1
-GitPython>=0.3.2.RC1
 gevent>=1.1rc4
 PyLD>=0.6.5
 six
@@ -9,4 +7,5 @@ future
 jsonschema
 jsonref
 PyYAML
-semver
+rdflib
+rdflib-jsonld