Updated build script to build.bat script
added reference to ranked_image_keywords.cs in example/build.bat and module/build.bat
Merge branch 'master' of https://github.com/redorb8/alchemyapi_csharp

merging README.md
Merge pull request #6 from redorb8/master

updated build.bat files to include ranked_image_keywords.cs, updated README.md