Merge pull request #69 from fardog/master

Adds Command Line Interface for generating PNGs from mermaid description files
Inclusion of tape tests in new test target for travis
Styling of sequence diagrams from css classes
Support for backslash in nodes
Support messages to self in sequence diagrams
Update README.md

Added an image example of a sequence diagram
Handling of min size of messages to self
New release
Merge branch 'master' of https://github.com/knsv/mermaid

Conflicts:
	README.md
Merge branch 'master' of https://github.com/knsv/mermaid

Conflicts:
	README.md
Fix for issue #70
Fix for issue #53