Improve the inspector UX in Neo4j Browser

- Show a selected state on captions in inspector.
- Let node resize circles sizes indicate their actions.

Both changes can be seen in the screenshot.

![oskar4j 2014-11-26 at 15 41 47](https://cloud.githubusercontent.com/assets/570998/5202964/cb408d74-7582-11e4-924f-82f62ba1f9de.png)