New variable in editor and three new themes

Proposals
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New variable: editor_info[vimode]
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Why? It was a big facilitation when I developed new themes.

New prompt themes: budspencer, terencehill, dangerous
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Why? I would like to have clearly visible indicators showing me which vi mode is currently active. The new themes have noticeable indicators on both sides and also change the cursor color. The cursor color is overwritten by the cursor or root highlighters. I think that's the desired behaviour. The themes are modifications of sorin prompt theme.
Other new features, compared to sorin's prompt, are a background job indicator and a ssh session indicator in front of the pwd prompt which is very useful for cut-n-paste, e.g. for scp.

Screenshots
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![dangerous](https://cloud.githubusercontent.com/assets/2333069/3105486/4766a266-e673-11e3-9ad5-ca09246b8bc1.png)

![budspencer](https://cloud.githubusercontent.com/assets/2333069/3105485/4763b600-e673-11e3-81d8-2966536e365d.png)

![terencehill](https://cloud.githubusercontent.com/assets/2333069/3105487/4768e04e-e673-11e3-8841-6dbb27e7df62.png)