Added partial support for private files

*   if dotfiles are shared by git, it will ignore
    all files under dotfiles/git-universe/private

*   if you use other sharing mechanism, you need
    to exclude these files other way
Renamed files to more consistent way
Split "global" gitconfig into separate specific ones
Added config for lennycz
Added grep coloring alias
Added more git aliases
Sorted git aliases by abc
Fixed typo in grep alias
Moved grep options to GREP_OPTIONS

Because using alias pollutes ps -f output.
Remapped paste toggle to <F4>
Improved showing of whitespace

*   show trailing space as well
*   use Unicode characters
*   toggle with <F2>