* Update go-gin-server templates to return a configurable library
Before this change, the user would be required to make changes in the
generated code. This makes it really hard to update the API and the
documentation at the same time. With this change, the generated code can
be imported as is and used. The user just needs to set the handler
functions for each endpoint.
* Use spaces instead of tabs for api files
* Use space instead of tab for ApiHandleFunctions in go-gin-server
* Update samples for go-gin-server
* copy from go-server and add go-gin-server generator
* change the templates for the gin
* fix warnings of the golint tool
* fix the path of script
* add samples
* delete unnecessary comments (#1048)
* make the help message more appropriate (#1048)
* fix the link address format (#1048)
* minor improvement
