Put generated files into a separate dir.
Merge pull request #74 from Abscissa/generated-dir

Separate "generated" dir, fixing dustmite build on OSX
Previous commit accidentally left changed.exe commented out.
Merge pull request #75 from Abscissa/generated-dir

Previous commit accidentally left changed.exe commented out.
Re-allow simple names for individual tool targets (like 'rdmd', 'ddemangle', etc.)
Use MODEL:=default behavior from druntime and phobos.
Add ddemangle to win32.mak.
Merge pull request #77 from Abscissa/individual-targets

Re-allow simple names for individual tool targets
Merge pull request #80 from Abscissa/ddemangle-win32-mak

Add ddemangle to win32.mak.
Fixed: win32.mak's tag rules were out-of-date and failed.
Merge pull request #81 from Abscissa/fix-win-mak-dman

Fixed: win32.mak's tag rules were out-of-date and failed.
Merge pull request #78 from Abscissa/model-default

Use MODEL:=default behavior from druntime and phobos.