Corrected Syntext plugin to allow C# and C++

now ~~~'c#'~~~ and ~~~'c++'~~~ blocks work
start work on new S3 publisher with more options

adding a new publisher that allows for clean urls in a file cloud like
S3 or azure
strip extensions and set content type

when publishing the site pyfs now gives you the option to strip the
extensions out of the file names leaving the urls clean