Minor fixes

Changed --hmac-cbc to --cbc-file to account for the next version of
cppcms_make_key included with CppCMS. Bug report:

https://sourceforge.net/p/cppcms/bugs/129/

Fixed bug in stdev where it wasn't actually using the result of
std::accumulate. However, since this function currently isn't
being used, this has no effect on the program.

Fixed tabbing issues in Javascript code.