Add *Interface suffix to all interfaces

[korotovsky]

Affected sub-projects:

• https://github.com/event-band/band-framework
• https://github.com/event-band/band-symfony-adapter
• https://github.com/event-band/band-serializer-jms
• https://github.com/event-band/band-symfony-bundle
• https://github.com/event-band/band-transport-amqp-lib

[chEbba]

I'm strongly against this. Yes, this code standard is usual for sf projects, but we have a separate project and can use our own standard. I can provide many arguments against, but this is just a code style holy war. My projects always have no such suffix for interfaces, because this suffix is redundant. But as this project goes to community we can discuss and vote.

[coyl]

I vote for *Interface. Sorry, chebba, but I'm with these guys =)