changes to support certificates on disk in addition to S3
only set letterhead if it exists on the filesystem
using boto instead of simples3 for certificate upload

This allows aws roles and a .boto file for authentication
changing defaults
adding CERT_VERIFY_URL as a setting
adding free fonts
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adding override for the template dir
adding TEMPLATE_DATA_DIR
updating boto
adding tests, cert_web_root configurable for tests
syntax
PEP8
adding travis file for tests
updating README for tests
fixing verify url
removing log subdir
typo
adding dummy key ID for unit tests
setting ownertrust from a file
adding comments, fixing grammar