Clean up repository

Added a more detailed description of the plugin to Readme and POM.
Increase snapshot version number to 1.1. Update gitignore. Remove IDEA
specific files, leftover manifest file, leftover bytecode files (jars
and classes)
Cleanup Readme, add License, add CI in POM
Add travis-ci support to test commits

Also add logo to readme
Remove unused commits in BukkitIRCdPlugin.java
Build against all JDKs in travis

Also disable email notifications, but allow IRC notification if a build
passes
Remove Travis-CI support

It seems to be broken for this plugin.
Add PluginMetrics image to Readme
Fix typo :)
Merge pull request #56 from ron975/development

General repository cleanup.