build targets

[mklabs]

add a few "build targets", like in the ant build script:

ant build     # minor html optimizations (extra quotes removed). inline script/style minified (default)
ant buildkit  # all html whitespace retained. inline script/style minified
ant basics    # same as build minus the basic html minfication
ant minify    # same as build plus full html minification
ant text      # same as build but without image (png/jpg) optimizing

images / htmlmin task needs to be implemented.