fix HEADER_VALUE_WITH_PARAMS regex and added a test case for this regex.
add support for mime types with dots, hyphens and plus signs.
Merge pull request #679 from patriciomacadden/provides

Fix HEADER_VALUE_WITH_PARAMS regex and added a test case for this regex.
Just some typos, here and there!
Merge pull request #681 from vipulnsward/cleanup_typos

Just some typos, here and there!