* fixed bug where nullApi.java would be generated. Instead, generated DefaultApi.java to match the default path /{pathParam}
* fix to bug #3157
* update samples
* add test cases to cover different collection format
* add space params to retrofit 1.x
* add space params to retrofit 2.x
* rename url to localVarUrl
* fix exception in haskell servant
* fix python flask NPE with oas3
* update perl default value, fix example value
* update android sample, fix example value
* restore x-swagger-router-controller for nodejs server generator
* update default value for bash client, fix example value, invalid tag
* update default value for objc
* update objc pestore core data