Specify background colour for highlight events.

Allow colours in formats to be hex. Closes #631.

Fix ordering of highlighted messages. #669.

Change highlights into proper displayable events.

Instead of wrapping the source event and modifying it, they are
now proper events that are displayed themselves (and the original
message is suppressed).

This allows highlights to be formatted differently.

Issue #669

Fix NPE in ShowTopic...

Closes #682

Only rejoin channels that active when disconnected

If a channel is parted for any reason other than a disconnect
(e.g. a local /part, or a remote part/kick) then the channel
shouldn't be rejoined on reconnection.

Closes #667

Track reasons for parting in Channel.

We'll use this to decide whether to auto-rejoin or not.

Issue #677

Add a checker for nightly updates.

Delete duplicate resources.

These are all present in res/, so there's no need for them
to be in src/. I think we just forgot to delete them after
switching to proper resource dirs.

Add a couple of tests for UpdateManagerImpl.

Fix the some copy and paste errors.
Add to the updater module.
Move the pattern to a field.

Simplify how we determine network names.

Guava provides a nice class which uses the public suffix list,
so we can ditch all of our hand-crafted logic and pathetically
small list of top level domains and do it properly.

Use KeyStoreLocator in CertificateManager.

Closes #664

Add a KeyStoreLocator.

This provides a nice interface to find a system-wide keystore
for us to use for trusted certificates.

Issue #664

Remove child event busses.

Closes #662.

Fix HighlightManagerTest.

Add source checks for eventbus handlers.

In preparation for child eventbusses being removed, anything
trying to subscribe to specific windows now needs an explicit
check.

Issue #662

Add a base class for events with a WindowModel source.

For #662, it makes sense to have a standard way to
get the source from events we may wish to filter.

This introduces a SourcedEvent interface, and adapts classes
to use it.

Automatic test tidying.

Remove some unused code.

Switch to new date APIs.

Update gradle to 2.11.

Update DMDirc repo to HTTPS.

Update date handling after parser changes.

The parser now uses the new API too, so we don't need to
do horrible things to convert.

Convert events to use new date APIs.

Java 8 introduces a sane API for dates; to store datettimes
we should now be using LocalDateTime.

Remove some unused code.