Add ``\\\\colon`` macro, fix spacing around colons. Fixes [ 246 ].
tree5d78b5e8ba519f0d8d0e4e6f33c1d4bd93cf84ea
drwxr-xr-x - docutils
drwxr-xr-x - prest
drwxr-xr-x - sandbox
drwxr-xr-x - web