Chemistry builds not compiling on dev

[evaneschneider]

PR #277 added two utility function calls to chemistry_functions.cpp, but the headers aren't included, so chemistry builds do not compile. Adding the headers fixes the issue (but I haven't done it yet on dev, only on RT, which will not get merged in soon).

[bcaddy]

I'll fix this. Should we add a chemistry build to our tests?

[evaneschneider]

Yeah, I think that's a good idea. We should probably spend a hack session looking at what code is / isn't covered in the current build matrix, and try to add whatever builds we need to get as much of the code covered as possible.

[bcaddy]

Fixed in PR #283