Update psycopg2

[ryanflood]

In setup.py you list the requirements

    install_requires=[
        'Flask==0.10.1',
        'WTForms==2.0.2',
        'Flask-Admin==1.2.0',
        'Flask-Bcrypt==0.6.2',
        'Flask-Login==0.2.11',
        'Flask-Mail==0.9.1',
        'Flask-RESTful==0.3.4',
        'Flask-SQLAlchemy==2.0',
        'Flask-Script==2.0.5',
        'Flask-WTF==0.11',
        'Pillow==2.8.2',
        'SQLAlchemy==1.0.5',
        'bcrypt==2.0.0',
        'gunicorn==19.3.0',
        'psycopg2==2.6.1',
        'boto==2.38.0',
        'BeautifulSoup',
        'flask-migrate==2.0.0'
    ]

But according to https://github.com/psycopg/psycopg2/issues/594 psycopg 2.6.1 will not work with latest version of postgres.

Upping it to 2.7 seemed to work without issue for me