Added a clang-format config file, in preparation for formatting jsoncpp.

    clang-format -style=llvm -dump-config > .clang-format
Set BinPackParameters to false.

This option personally drives me crazy. I think it's much more readable
to be able to see one parameter per line when there are many.
Ran clang-format over all .h and .cpp files.

    clang-format -i $(find . -name '*.h' -or -name '*.cpp')
Fixed some clang-format weirdness.