Initial commit of link reference generation script

Initial commit of _scripts/cfdoc_createlinks.py and _scripts/cfdoc_linkresolver.py. The former is a script that can be run in order to generate a _references.md file. That file contains link information for markdown files in a directory and can be used by the Jekyll plugin https://github.com/olov/jekyll-references, which can aid in resolving links in markdown. The file cfdoc_linkresolver.py contains the functions used to generate the reference file. Usage is contained in code comments of cfdoc_createlinks.py.