Add CSP Bandpasses

[dannygoldstein]

From http://csp.obs.carnegiescience.edu/data/filters.

[kbarbary]

Sweet. A couple notes:

• All the existing built-in bandpass names are all lowercase. Can you change, e.g., cspB to cspb to follow this convention?
• Remove extra spaces after , in builtins.py to follow PEP8 and get tests passing.
• csphs / csphd for denoting Swope and Dupont is OK but seems pretty cryptic (even more so than band names normally are). On the other hand csphswope /csphdupont gets hard to read. I've boxed us in here by not using _ in any existing bandpasses! If there's no good ideas we can stick with the extremely short names.

[dannygoldstein]

First and third bullets are done. For the third, I added a column to csp_filter_info.dat that indicates the telescopes (Swope or DuPont) to which the filters are attached. The second bullet was OK as of e7a62f8.

All unit tests are passing.

[dannygoldstein]

Hold on. There is a typo on the CSP website. On http://csp.obs.carnegiescience.edu/data/filters, the second V band filter is called "V-3099", whereas in Stritzinger et al. (2011), it's called "V-3009". Updating this here.

[dannygoldstein]

This is ready to go.

[kbarbary]

OK, sounds good to me.