Merge branch 'features/cflags' into develop

Conflicts:
	lib/spack/spack/cmd/find.py
	var/spack/repos/builtin/packages/ghostscript/package.py

var/spack/repos/builtin/packages/lua/package.py

@@ -57,7 +57,7 @@ class Lua(Package):
         placement='luarocks')
 
     def install(self, spec, prefix):
-        if spec.satisfies("=darwin-i686") or spec.satisfies("=darwin-x86_64"):
+        if spec.satisfies("arch=darwin-i686") or spec.satisfies("arch=darwin-x86_64"):
             target = 'macosx'
         else:
             target = 'linux'