Merge pull request #72 from fehguy/master

added security sample
fixed typo
added leading slash, no trailing slash validation per #101
added security example
Modified Swagger Object based on comments.
added example for model property
Merge branch 'master' of github.com:reverb/swagger-spec
added example for model property
Fixed $ref to json
Minor description change
Removed default "in" values

Since `in` is mandatory, there's no point to having a default value.
removed minProperties per #105
added support for #106
made description optional per #113