Adds DSL/CVX indentation examples.

[acristoffers]

Adds code snippets indented according to CVX's DSL. Only the relevant CVX blocks are present. The rest of the files' contents were stripped. The code was extracted from CVX's example folder and reprocessed as follows:

• mhstyle was run on the files to make them look nicer.
• The code was then reindented using the rules commonly seen in CVX code. I did not create nor remove indentation to my liking. The indentation in those files reflects what I've seen in the original files.

[florianschanda]

One minor request: Can you please also add a README.md in that directory that explains the copyright/license/origin of these files. Specifically:

• is the copyright yours or somebody elses?
• in the second case, where the (modified) files (e.g. "public domain example on cvx website") including the process you described above in your opening comment

If they do come from the CVX website this will be really easy as they state that the examples are in the public domain.

[acristoffers]

I detailed where things came from and put links there. Unfortunately, the tarball is not versioned, so the link points to the latest release. I doubt they will change anything in that directory, though, as those projects are usually pretty stable.