Added a demos folder and updated regexes (#3512)
Added a demos folder and updated regexes (#3512)

I added a check for case-sensitivity to the regex's. In my repositories, I have both a Docs and Demos folder and those wouldn't have been matched before. Now, they would.
mwpastore/linguist,github/linguist,christop/linguist,christop/linguist,yyx990803/linguist,R4PaSs/linguist,tschf/linguist,sebgod/linguist,MahmoudFayed/linguist,pchaigno/linguist,erkyrath/linguist,JJ/linguist,sebgod/linguist,stanhu/linguist,stanhu/linguist,stanhu/linguist,sebgod/linguist,yyx990803/linguist,stanhu/linguist,erkyrath/linguist,github/linguist,github/linguist,pchaigno/linguist,pchaigno/linguist,pchaigno/linguist,R4PaSs/linguist,JJ/linguist,erkyrath/linguist,JJ/linguist,sebgod/linguist,github/linguist,MahmoudFayed/linguist,tschf/linguist,yyx990803/linguist,JJ/linguist,erkyrath/linguist,yyx990803/linguist,mwpastore/linguist