VERSION file added (root of the project).
Update README.md (link to doc/ removed)
Update README.md : Quickstart #3 : Launching merlin.py :
Indicates that double-click on merlin.py is better than the command line.
Logo SVG + PNG modified.
More space between the logo and the text.
Logo changed in README.md to the new logo, more spaced.
doc/index.md added.
Added the "Why using Merlin" chapter.
Minors modifications in doc/index.md.
Configured .gitignore to ignore the doc/html files.
Merge branch 'doc' of https://github.com/titouandk/Merlin into doc