Api-designer problem with metadata and content or contents


i’d like to work on an api to store the raml files with the latest version of api-designer.
Actually i encountered two problems :
1/ I don’t understand if the JSON file should contain a “content” attribute or “contentS” attribute. In the doc of file system it seems to be content but in the code i found contents. So which one is the good ?

2/ When i try the API designer i’ve got a problem loading a specific file for the meta, this file seems not necessary but i’m not sure ? The meta should be saved as a new file (example.raml.meta) or should it be embedded in the RAML file like in the doc of file system ?

I took the master branch of api-designer for my tests, is it the good branch ?