Metadata creation, index page, page alias edition.

 - When you attempt to read a file or to create/edit one, a json
   metadata file is created / read.
 - It contains 2 fields: index and aliases, index is the path of the
   index file, aliases is an object with the file names aliases.

TODO:
 - Alias can be inputed, and is transmitted to the server, it is even
   read server-side, but it isn't saved.
 - Metadata file is not commited when ran in git mode.
Updated TODO to Markdown format.
Better Markdown, with titles
Better alias support, read-only for now
Better alias support, read-only for now
Better file alias support, now saving/editing a file will save/edit the alias too
added syntax highlight using highlight.js
Merge pull request #1 from raphaelmonrouzeau/master

Alias support
Merge branch 'master' of https://github.com/dryman/nodewiki into dryman-master

Conflicts:
	TODO.md
	lib/mdserver.js
Updated Readme.md, hoping to add some new features to this wiki since the origin fork has not been updated in awhile.
revised readme
Added option for git auto push
Removed support for legacy arguments format, removed the check on -l to see if you already set with either -a or with an environmental variable (because there was no check on -a, why put one only on -l?), added check for existsSync as it was dependent on newer (well, not that new) versions of node.
Added new git auto push option to readme
syntax error, todo: add unit testing
allowedExtensions now uses an array, better readability and performance
Prep files for future work
Near complete rewrite of nodewiki using Backbone. Pulled in the new ghost.org blog markdown editor with live preview using Showdown. Currently broke the support for sub folders. TODO: render markdown previews entirely client-side with Showdown.
Remvoed the readme file, as it does not accurately show the new skin. Added a copy of the shortcuts supported, also available on the github wiki for the project.
Minor fix for meta.js, was missing writeMeta as internally available method under the writeMeta variable name.