Remove indirect dependencies. (#245)

* Remove indirect dependencies.

* Bump schema salad.

Author: tetron

setup.py

@@ -46,10 +46,8 @@
           'requests>=1.0',
           'ruamel.yaml == 0.12.4',
           'rdflib >= 4.2.0, < 4.3.0',
-          'rdflib-jsonld == 0.3.0',
-          'html5lib >=0.90, <= 0.9999999',
           'shellescape',
-          'schema-salad >= 1.21.20161206181442, < 2',
+          'schema-salad >= 1.21.20161206204028, < 2',
           'typing >= 3.5.2',
           'cwltest >= 1.0.20160907111242'],
       test_suite='tests',