fix description
for tramp
remove traling space
* Remove caching of date regexp

* Change face name
  color-dired-changed-today-default-face -> color-dired-changed-today-face
  color-dired-changed-this-week-default-face -> color-dired-changed-this-week-face
  color-dired-changed-last-week-default-face -> color-dired-changed-last-week-face
  color-dired-changed-last-week-before-default-face -> color-dired-changed-last-week-before-face

* hide non-public functions
* obsolete customize variable
 `color-dired-time-regexp' but create hiding variable `color-dired-general-time-regexp'

* new customize variable `color-dired-suppress-guessing-at-remote'

* hexfy color