Version 1.9

1. Breaking Change Refactor template system:

   1. The input data model now contains all the properties including system generated metadata starting with underscore _ and globally shared variables stored in __global. You can use docfx build --exportRawModel to view the data model.
   2. Preprocessor's transform function signature changes to:

   exports.transform = function (model){
       // transform the model 
       return model;
   }

2. Provide a new embedded template statictoc with TOC generated in build time. Webpages generated by this template is PURE static and you can simply open the generated webpage file to take a preview, no local server is needed.

3. Allow switch markdown engine.

4. Allow export metadata to manifest file.

5. Improve exclude logic to help avoid PathTooLongException. (#156)

6. Provide with a config file named search-stopwords.json to customise full-text search stop-words. (#279)

7. Bug fixes:

8. Fix bug when cref contains loop. (#289)

9. Make sure id is unique for each HTML in markdown transforming. (#224)

10. Fix index range bugs in YamlHeaderParser. (#265)