Add requirements file for pip

requirements.txt

+alembic==0.8.8
+aniso8601==1.1.0
+bcrypt==3.1.1
+blinker==1.4
+cffi==1.8.3
+click==6.6
+Flask==0.11.1
+Flask-Bcrypt==0.7.1
+Flask-Login==0.3.2
+Flask-Mail==0.9.1
+Flask-Migrate==2.0.0
+Flask-Principal==0.4.0
+Flask-RESTful==0.3.5
+Flask-Script==2.0.5
+Flask-SQLAlchemy==2.1
+Flask-WTF==0.13.1
+itsdangerous==0.24
+Jinja2==2.8
+Mako==1.0.4
+MarkupSafe==0.23
+passlib==1.6.5
+pycparser==2.16
+PyMySQL==0.7.9
+python-dateutil==2.5.3
+python-editor==1.0.1
+pytz==2016.7
+six==1.10.0
+SQLAlchemy==1.1.1
+Werkzeug==0.11.11
+WTForms==2.1