Add init-theme.el. Add tang-2 color theme. Set tab-width 4 of c-mode.
Revert "Add init-theme.el. Add tang-2 color theme. Set tab-width 4 of c-mode."

This reverts commit dcb6a7ac10f332742000cc2b280266aa6ed37a77.
Merge branch 'master' of github.com:SmallOldMan/emacs.d
Add init-theme.el. Modify c-mode style.