Convoy v0.5.2 release

Added custom S3 endpoint support. Thanks to @JohnStarich !

Convoy v0.5.1 release

Fix "Handler not found: POST /VolumeDriver.Capabilities" for Docker v1.12 

Convoy v0.5.0 release

WARNING: From v0.5.0 forward, we won't support configuration file PRIOR to
v0.5.0. It's suggested to backup your old configuration directory(normally
/var/lib/convoy), rename it and back it up, and start a new Convoy v0.5.0 daemon
with a new /var/lib/convoy. You can use Convoy backup/restore feature to restore
previous volumes, e.g. back it up in the old Convoy version, then restore it in
the new version.

Changelog:
1. Convoy metadata overhaul. Don't compatible with version before 0.5.0.
2. Docker v1.10  support. `Get` and `List` API support
3. Now support start daemon ignore current configuration, and support delete
multiple volues.

Update development.md (#160)

build: Add automatic version

Convoy v0.5.0.2-rancher release

For rancher use only

Convoy v0.5.0.1-rancher release

For Rancher use only.

Convoy v0.5.0-rancher release

For Rancher use only.

Merge pull request #81 from cjellick/send404

Return 404 status code on get and delete

Merge pull request #80 from cjellick/fixes

Implement Get and List and other improvements