Autoscaling for all diagram types

[knsv]

It is not uncommon when integrating mermaid on a documentation site that some of the diagrams in the generated documentation is wider then the allocated width for the content.

As the diagrams are svgs they could scale instead of flowing over.

However it would be undesirable to have a the diagram grow in width. Imaging a single box in a flowchart diagram autoscaling to 1200px. So the diagrams should only scale to zoom out.

[knsv]

As this could potentially make svgs less functional outside the browser the new functionality can be turned off with new configuration parameters:

flowchart.useMaxWidth: [true|false]
sequenceDiagram.useMaxWidth:[true|false]

[knsv]

Fixed and pushed into master. Will be included in 0.5.1

[knsv]

Fixed with release 0.5.1