Fixed contributing.md
Modified CONTRIBUTING.md
Modified CONTRIBUTING.md->Fixed step-7 and step-8
Removed step-7,8
Merge pull request #479 from SoumenG/mjolnir
Add Soumen Ganguly to contributors
Merge pull request #481 from nickdesaulniers/new_contrib
Trim URL on submit when adding manifests or URLs, fixes 178
(cherry picked from commit af253a5436cb0d63565a7de9b85a5333cf77c430)
Merge remote-tracking branch 'upstream/master'