fix allowing validation of non-string query/path args (closes issue #11)
Merge pull request #18 from gchin/master

fix allowing validation of non-string query/path args (closes issue #11)
Adds ability to validate Swagger specs

- tests both valid and invalid swagger specs
- exposes validate_swagger_spec function

Conflicts:
	tests/sample_swagger_spec.json
Integration with tween and docs

Resolves #14
Remove validation tests against 3.x due to Issue #20