Adds emacs c++ improvements.
Adds emacs c++ improvements.

1) Adds "M-x include-what-you-use" command that will tell you which
   includes should be added and removed.

2) Adds "M-x ninja-build" command which builds the current file.

3) "M-x split-related-files-from-header" now works from the
   corresponding .cc file too.

rsolomakhin/dotfiles