Use v1 prefix in the url for api versioning
Update rspec doc api for versioning
Merge branch 'examples' into api-versioning

Conflicts:
	doc/api/index.json
	doc/api/v1/sessions/sign_in_with_invalid_password.json
	doc/api/v1/sessions/sign_in_with_valid_password.json
Use V1 instead of Api::V1
Merge branch 'examples' into api-versioning
Merge pull request #102 from fs/api-versioning

Api versioning