Initial implementation of package specs, including parser.

spec.py can parse full dependence specs like this:
	openmpi@1.4.3:1.4.5%intel+debug ^hwloc@1.2

These will be used to specify how to install packages and their dependencies,
as well as to specify restrictions (e.g., on particular versions) for
dependencies.  e.g.:

class SomePackage(Package):
	depends_on('boost@1.46,1.49')

This would require either of those two versions of boost.

This also moves depends_on out to relations.py and adds
"provides", which will allow packages to provide virtual
dependences.

This is just initial implementation of the parsing and objects
to represent specs.  They're not integrated with packages yet.

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