Add some missing parameters to parser events.

Tidy up CallbackManager very slightly.

Add events for each CallbackInterface.

Remove all usages of getCallbackType.

All callbacks are now done through getCallback, which offers
type safety (gasp!) and is potentially extensible in the future
(wow!).

This means that nothing can depend on callbacks existing, so
there are two functional changes:

 - the parser will no longer disconnect automatically on failed
   pings; users have to listen for the event and handle it
   themselves;

 - the parser will no longer attempt to automatically use alt
   nicknames or create new nicknames on connection; users have to
   listen for the event and implement the logic themselves

Both of these were really weird anyway, as adding a listener (even
for debugging purposes) disabled the built-in behaviour.

Specify proper dependency versions.

Use forEach where possible.

Very minor tidying.

Lambda.

Update build scripts for artifactory.

Gradle version bump.

Tidy up gradle source sets.

This replaces the default source directories (src/main/java, etc)
with our own, instead of just appending ours to the list.

Add java 8, run away from Dataforce

Tell gradle to use 1.8.

Switch CI to j8

Remove signing configuration.

This breaks CI, and the way the plugin works means you need your
password stored in a config file, which I ain't doing.

Will manually sign releases for now, I guess.

Move git versioning code into a plugin.

Will pull this out into a proper plugin shortly, just wanted
to get it structured right and working.

Advertise support for self-message. Fixes issue #16

Delete .gitreview

We've ditched gerrit for DMDIrc, so this is now rather pointless.

Add signing plugin.

Write a load of extra info to the POM.

Issue #12.

Create source and javadoc artifacts.

Issue #12

Add support for message tags from IRCv3 to IRCReader. Fixes #6

ReadLine now parses tags out of incoming lines (tags are not currently passed through the encoder)

IRCParser.tokeniseLine() now understands that tags may exist at the start of a line and tokenises accordingly.
(In reality, the only time it ever sees them is during testing)

Parser processLine now looks for timestamps from tags from the ReadLine, not by parsing token[0] itself.

Made IRCReader tests a lot less annoying to work with.

Add CircleIO config.

Add support for publishing builds from gradle.

This is getting a bit repetitive :)

Change-Id: I6403ff3ab6c96a10c380646152571603ae3b83fb