Add build failure notification support #5
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This adds support for collecting (potentially) multiple BuildExceptions that can occur when executing multiple targets at once, combining them into a single exception string and throwing a single BuildException to Ant. This provides each failure's stacktrace in a newline delimited format for the user to investigate.
Additionally, if a BuildException does occur the executor is signaled to shutdown, stopping the build once the remaining targets that are currently running have completed.