* Auto type determination was broken in some unit tests. This has been fixed.

* The following new build options have been added:
    - release (default)
    - debug
    - unittest
* Debug libraries are now generated by the build-dmd scripts and have a "-d" appended to their name.  These libraries have both "-g" and "-debug" set to enable asserts and symbol info.
* Added unittest.d to run unit tests.
* Added test-dmd.bat to build and run unit tests on Win32.  A problem currently exists with this feature, and once it has been resolved a test-dmd.sh will be added as well.

git-svn-id: http://svn.dsource.org/projects/druntime/trunk@47 4a9d5153-6564-4b3f-b5e1-7e8e9dac548f