Add python pip requirements to fit La Cagette usage

lacagette_addons/requirements.txt

+Babel==1.3
+beautifulsoup4==4.5.3
+CouchDB==1.2
+Jinja2==2.7.3
+Mako==1.0.1
+MarkupSafe==0.23
+Pillow==3.1.1
+Python-Chart==1.39
+PyYAML==3.11
+Werkzeug==0.9.6
+argparse==1.2.1
+decorator==3.4.0
+docutils==0.12
+feedparser==5.1.3
+gdata==2.0.18
+gevent==1.0.2
+greenlet==0.4.7
+jcconv==0.2.3
+mock==1.0.1
+numpy==1.16.6
+ofxparse==0.14
+passlib==1.6.2
+psutil==2.2.0
+psycogreen==1.0
+psycopg2==2.7.3.2
+pyBarcode==0.8b1
+pyPdf==1.13
+pydot==1.0.2
+pyparsing==2.0.3
+pyserial==2.7
+python-dateutil==2.4.0
+python-ldap==2.4.19
+python-openid==2.2.5
+pytz==2014.10
+pyusb==1.0.0b2
+qrcode==5.1
+reportlab==3.1.44
+requests==2.6.0
+simplejson==3.17.2
+six==1.9.0
+suds-jurko==0.6
+vatnumber==1.2
+vobject==0.6.6
+wsgiref==0.1.2
+xlrd==2.0.1
+XlsxWriter==1.3.7
+xlwt==0.7.5
+zipp==1.2.0
+