Example configuration file update:
  - Fix config database default location.
  - Add SSL/TLS for WebSockets config. Currently commented out.
Add Arch Linux PKGBUILD:

The install process will first fetch the tip of the master branch
to build the latest official rippled release. It will also create
all the necessary data directories in /var.

An optional systemd service definition file is included.
Fedora RPM support:

- Add RPM spec file
- Whitelist Fedora during SConstruct
Refactor ECDSA canonical checks:
* Add signature canonicalization unit tests
* Tidy up into new classes and functions
Transactor journal support and small cleanups
OfferCreateTransactor cleanups:
- Use std containers instead of their boost counterparts
- Reduce transactor console verbosity
- Remove unneeded parameter shadowing member variable
- Remove BOOST_FOREACH
- Add comments
- Small cleanups
Add beast SConstruct and .travis.yml
Move hardened_hash to container/