Mirror `npm version` format for git tags

See https://github.com/bower/bower/pull/961#issuecomment-33981712 and  https://github.com/bower/bower/pull/961#issuecomment-35591108 for more context.
Fix Markdown typo in CONTRIBUTING.md
Merge pull request #1291 from danfinnie/patch-1

Fix Markdown typo in CONTRIBUTING.md
Update README.md

Fixed sentence which had 'set manually' accidentally repeated.
Resolve a situation in which the install process gets into an infinite loop
Merge pull request #1307 from thomasmulvaney/patch-1

Fixed typo in README.md
Merge pull request #1306 from wibblymat/dependency-loop

Resolve a situation in which the install process gets into an infinite loop
Merge pull request #1278 from jfsiii/patch-1

Mirror `npm version` format for git tags