More visual clues for editing Flux files

**Display command input and output types in outline view**

The outline view now contains the input and output types of the individual commands:

![metafacture-ide-outline-types](https://f.cloud.github.com/assets/128229/642396/8c567bd6-d359-11e2-8bdd-665a94ba27ea.png)

**Generate DOT with Xtend to visualize Flux workflows with Zest**

On saving a *.flux file in the editor, the generator will create a corresponding *.dot file in the project's `src-gen` folder. With the Zest graph view open and listening to changes in the workspace (see user guide for usage details), this visualizes the workflow currently edited in the Flux editor (see also #7):

![metafacture-ide-workflow-visualization](https://f.cloud.github.com/assets/128229/642398/c28566fe-d359-11e2-944c-2fb4c274f643.png)

Deployed for testing - @acka47 could you give it a try?