Integrate Markdown Editor, add Markdown HTML preview to Node perspective

[paulvi]

we just start to redistribute Markdown jars from nodeclipse.org/update, but we also need to update Node perspective: add Markdown HTML preview

Markdown HTML preview will be also used for Literate CoffeeScript, see #26 Add CoffeeFileWizard

Eclipse Help - Perspective Extensions
see Example

http://stackoverflow.com/questions/16254267/eclipse-plugin-how-to-extend-perspective-with-view-that-is-implemented-by-exte

[paulvi]

I also propose following order of views in the South section:

Console, Problems, Markdown HTML preview, Error Log

[paulvi]

Should we add Internal Web Browser to Node perspective?

[tomotaro1065]

I think we don't need Internal Web Browser. Because Node.js is not only for web systems.
Even if we need it, but it should be added to Debug perspective.

[paulvi]

I propose the following order of views in the South section:

Console, Markdown HTML preview, Problems, Error Log

This is more logical.

[tomotaro1065]

Version 0.4 has been released.