Trim down requirements.txt

requirements.txt

@@ -1,23 +1,12 @@
 Babel==2.3.4
-backports-abc==0.5
-blinker==1.4
-certifi==2016.9.26
-click==6.7
 configobj==4.7.0
 Flask==0.12
 Flask-Babel==0.11.1
 Flask-Login==0.4.0
 Flask-Principal==0.4.0
 iso-639==0.4.5
-itsdangerous==0.24
-Jinja2==2.8.1
-MarkupSafe==0.23
 PyPDF2==1.26.0
-pytz==2016.10
 requests==2.12.4
-singledispatch==3.4.0.3
-six==1.10.0
 SQLAlchemy==1.1.4
 tornado==4.4.2
 Wand==0.4.4
-Werkzeug==0.11.15