Add link to online PEP 438 checker
Bump version (post 0.2.0)
Fix broken README link
pep438 checks if a package exists on PyPI prior to obtaining link count.\n\nA message stating such will be printed to stderr
Merge pull request #5 from dobrite/issue-4

Checks if a package exists on PyPI prior to obtaining link count.
Add some cli tests for valid and invalid packages
Separate stderr output with newlines
Update CHANGES file
Add AUTHORS file
Update and link to CONTRIBUTING file
Add emails/links to AUTHORS file
Bump version (0.3.0)
Bump version (post 0.3.0 release)
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