all: don't hard code static paths

We cannot hard code those paths, we need to get ready fo S3 integration
:-)

Related to #6.
app: add s3 support for serving statics

I still need to make a script that copy those statics, but we're ready
to serve them :-)

Related to #6.
requirements: add Flask-S3
requirements: add boto
app: add environment variable for enabling or disabling debug
upload_static: add script

This script will upload static files to S3 bucket. It uses some private
functions from flask_s3 because flask_s3.create_all will try to create
the bucket, and we don't have permission to create the bucket, just to
use it. We may send a patch to them later.

Related to #6. Once I add a hook for uploading files, we can close this
issue.
app.conf: add file with hook for uploading static files to S3