Small fix in Request URL generation
clean-up example projects
Add general query parameters

Those parameters can be set in the client class and will be added to
each request.
More options for calling the generator.

--no-date to create the library directly in the defined folder
--all to create client libraries for all Google APIs at once
Parameter checking, basic error handling, ...
Update README
Change parameterType function to const Map
Better error handling
Fix library names to follow pubspec specifications
Fix location of dart.js for examples
More clean-up
Use oauth2_client from Pub
Update readme
Add OAuth2 scopes as const to client definition
More documention for the methods
Update client libraries included in examples
Add checks for required parameters
Add checks for "enum" parameters
License, contributors, readme for genereated libs
fix enum check, code clean-up