Add PyPI search functionality

Allows you to find the package name and URL. **Note: May be vulnerable to XML attacks. See [this](https://docs.python.org/3.4/library/xmlrpc.client.html)**

    <dmzda> burritobot: pip: flask
    <burritobot> dmzda: Flask 0.10.1: http://github.com/mitsuhiko/flask/
    <dmzda> burritobot: pip: flask-
    <burritobot> dmzda: Package flask- not found. Alternatives: flask-ab Flask-ACL Flask-Actions Flask-Admin Flask-Administration Flask-AlchemyView flask-alchy Flask-Analytics Flask-And-Redis Flask-API