Write out and parse full GObject property information (readable, writable, etc)

Write out and parse full GObject property information (readable, writable, etc)

	* girepository/girparser.c: Default to "readable" for properties.
	* giscanner/ast.py: Add readable, writable etc.
	* giscanner/girwriter.py: Writ them.
	* giscanner/glibtransformer.py: Inspect them.
	* tests/*: Update.

svn path=/trunk/; revision=587