BUG: fix print_config to display proper file location (if defined).
REF: don't use get_path in enstaller.main anymore.
ENH: don't use get_path in prepend_url anymore.
DOC: document the filename property.
Merge branch 'master' into fix_config_path

Conflicts:
	enstaller/tests/test_config.py
BUG: fix tests on windows following master merge.
Merge pull request #165 from enthought/fix_config_path

Fix config path