fix pip dependencies

requirements.txt

 arrow==0.4.2
-beautifulsoup4==4.4.1
-catfish==1.4.2
-chardet==2.3.0
 click==6.7
-command-not-found==0.3
-decorator==4.0.6
-defer==1.0.6
 eventlet==0.22.1
 Flask==0.12.2
 Flask-SocketIO==2.9.4
 greenlet==0.4.13
-html5lib==0.999
 ics==0.3.1
 inflect==0.2.5
-ipython==2.4.1
 irc==16.2
 itsdangerous==0.24
 jaraco.classes==1.4.3
@@ -24,43 +16,12 @@ jaraco.logging==1.5.1
 jaraco.stream==1.1.2
 jaraco.text==1.9.2
 Jinja2==2.10
-language-selector==0.1
-lightdm-gtk-greeter-settings==1.2.1
-lxml==3.5.0
 MarkupSafe==1.0
-menulibre==2.1.3
 more-itertools==4.1.0
-mugshot==0.3.1
-netaddr==0.7.18
-onboard==1.2.0
-pexpect==4.0.1
-Pillow==3.1.2
-pkg-resources==0.0.0
-psutil==3.4.2
-ptyprocess==0.5
-pycups==1.9.73
-pycurl==7.43.0
-pygobject==3.20.0
 pystache==0.5.4
-python-apt==1.1.0b1+ubuntu0.16.4.1
 python-dateutil==2.6.1
-python-debian==0.1.27
 python-engineio==2.0.2
 python-socketio==1.8.4
-python-systemd==231
 pytz==2018.3
-pyxdg==0.25
-reportlab==3.3.0
-requests==2.9.1
-sessioninstaller==0.0.0
-simplegeneric==0.8.1
-six==1.10.0
 tempora==1.10
-ubuntu-drivers-common==0.0.0
-ufw==0.35
-unattended-upgrades==0.1
-urllib3==1.13.1
-usb-creator==0.3.0
-virtualenv==15.0.1
 Werkzeug==0.14.1
-xkit==0.0.0