RSS and archive cmplete implementation

New :
- archives and rss feed processing are now fully implemented

Fix :
- corrected the "draft" check routine. A wrong "if" statement could
lead to draft post to be processed, and reverse.

Changes :
- added generated site files to .gitignore to avoid polluting the repo.
- Changed templates variable calls in some template files to reflect
new naming and meta array.
- Changed HTML header processing to include contextual "description"
meta-tag filling