Fix bug I accidentally introduced.

@treyhunner this problem could have been avoided with a test.
Rename reqfile-parser to requirements-parser
Refactor command line test patching
Add test for stdin
Fix broken patching and assertions in tests
Add option to show only errors
Use different symbol for invalid packages
Add "-u pypiuser" argument

Signed-off-by: Trey Hunner <trey@treyhunner.com>

Conflicts:
	pep438/main.py
Add command line test for PyPI user packages
Update CHANGES file
Add @ronaldoussoren to AUTHORS file.  Thanks!
Fix link counting

Changes:
- Don't count duplicate URLs (fixes #9)
- Only count links with rel of "homepage" or "download" (fixes #10)
Rename "links" to "URLs" which is more correct