Implemented parallel execution of targets in the project
Added target name to messages logged by tasks
Aligned syntax with C#/.NET 2.0
Merge branch 'master' of https://github.com/x2048/nant
Added -j command line option to control whether targets are executed concurrently
Refectored build script to make use of -j switch
Added automated test for concurrent execution of targets
Added test for sequential execution and fixed the test for concurrency
Added -j to NMake Makefile
Merge pull request #105 from x2048/master

Implemented parallel execution of targets in the project