Merge pull request #4 from laeubi/master

Fix for AE-269, AE-270, AE-259
More performance logging
dump enablement state of classloadercache in initialize
Optional setting to write compile errors to own file
Log debug informations with level debug
Multi threading safety
Log stop watches on 'Verbose' level by default
Support for ECJ multi threading
In case one thread crashes, cancel all other running thread to stop the
failing build as fast as possible
Error message
Avoid NullPointerException in case a project has no build.properties
New tasks and types: workspaceDirSet, refreshWorkspace and
targetPlatformFileSet
Merge pull request #5 from ant4eclipse/2012_10_22_enhancements

Enhancements
Removed logging
Add 'build.properties'-dependencies to all types of classpath

In Eclipse, dependencies added via 'build.properties' are both on the
compile- and the runtime classpath.
Use ConcurrentHashMap to avoid concurrency problems
Better exception handling in case a bundle cannot be resolved
Avoid NullPointerException
~ Fix: [AE-271] MissingFormatArgumentException with some compiler output
Merge branch 'master' of http://github.com/ant4eclipse/ant4eclipse.git