Add trunk/Scripts/Bash/Functions/Html structure to handle html
    functionalities.
    
        - While I was preparing trunk/Identity/Models/Html, I found that
          updating headings in each html page was very tedious task, and
          enven more when start creating tables of content to illustrate
          how they look.
    
          At this point I thought to build a tool function to automate
          that task, later I doubt about it, but found that the idea comes
          time after time while I do the same thing time after time, so
          try to leave laziness one side apart and try it.
    
          The current scripts structure is quite flexible, so it is matter
          of adding a few files. The base structure of html functionality
          is added in this commit. It is invoked using the command:
    
            centos-art html --update-headings='path/to/dir' --filter='filename'
    
          that's it. Still unfunctional but that's it how we call it in
          our centos-art.sh script design. If you don't use the --filter
          option then replacements are applied to all valid html files in
          path/to/dir. Otherwise, if you use --filter, filename is
          appended to path/to/dir as path/to/dir/filename in order to
          apply replacements to that specific file.