Optimize jetty startup when dealing with directories on the classpath

[StrongSteve]

• Jetty startup is very, very slow when there are exploded directories on the classpath
• Jetty startup is rather fast when there are only JAR archives on the classpath
• Created a new optimized webappclassloader that detects archives on the classpath, creates JAR archives for them and adds the archive to the classpath
• Possibility to exclude specical directories via regular expressions (for example .web. to leave web modules as they are to enable tapestry live reloading)
• Extend the eclipse plugin to enable/disable the usage of the optimized class loader
• Extend the eclipse plugin to define the exclusion patterns
• Change everything to java 1.8 (source and compile level)