ffi_qaqc fix

[bpbond]

So, the problem documented in #104 was

1. CRAN's R CMD CHECK runs the function examples
2. The ffi_qaqc() example runs (#' x <- ffi_qaqc(fd, ...
3. rmarkdown::render() is called within ffi_qaqc
4. render generates some intermediate products in (by default) the working directory
5. CRAN errors because you're not allowed to write there

This PR adds intermediates_dir = output_dir to the render call, which should fix things. I also fixed a syntax problem in the ffi_metadata_match documentation

Closes #104

[wilsonsj100]

Ah okay, so I missed one of the temp_dir's that we needed. Thank you for tracking this down!

[wilsonsj100]

That makes sense regarding the intermediate files. Thank you!

[wilsonsj100]

I guess we likely need to resubmit as 1.2.1 now that this has been changed - correct?

[bpbond]

Hahaha yes don't forget the version number bump!