Add documentation in HTML format

A new folder has been added to the repository named doc, this folder
contains the documentation for the project as it is so far.

The main contents are:
    - Introduction
    - Description
    - Tutorial
    - Installation Tutorial
    - Links to the usage examples (these should be changed once #96 is
      fixed).

Fixes #107
Add Fork me on GitHub ribbon
Add note about documentation on ChangeLog.md
Merge branch 'master' of git://github.com/qiime/emperor into issue_107

Conflicts:
	ChangeLog.md
Change links to point to emperor.colorado.edu
Fixed view menu conflicts
Fixing indentation, comments and biplots visibility checkbox
Updating changelog
Merge pull request #130 from meganap/view_menu_2

Fixed view menu conflicts
Remove script usage examples

The examples have been removed from the respository.

This pull request should take care of the first item in #129
Merge branch 'master' of git://github.com/qiime/emperor into issue_107

Conflicts:
	ChangeLog.md
Remove PSD files from the img folder
Update index.html and description_index.html

These files now display images with the latest version of Emperor i. e.
post view_menu_2 merge.

It also features a couple corrections that @antgonza made to the main
text.
Update files to the latest version of Emperor
Update tutorial images and text

These updates were required based on the latest changes that have
ocurred in the repository.
Working version but want to do some more test to change the resolution of the image and/or add the option for pdfs
Change links to emperor.colorado.edu/master/...

These examples are built from the master branch every five minutes in
emperor.colorado.edu.
Merge pull request #135 from ElDeveloper/no_examples

Remove script usage examples
Changing default color scheme to discrete
Adding tests. Fix #136