added the nwinkler_random_colors theme

themes/nwinkler_random_colors/README.md

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+# Nwinkler Random Color Theme
+
+## Description
+
+The *Nwinkler Random Color* Theme is based on the [nwinkler theme](https://github.com/Bash-it/bash-it/wiki/Themes#nwinkler), but it randomizes the colors for:
+
+* time
+* username
+* hostname
+* path
+
+The random colors are chosen the first time this theme is used and saved to the `~/.nwinkler_random_colors` file. So, the next time you connect to the same machine, you will get the same colors.
+
+To force new random colors to be selected, run the command:
+
+```sh
+randomize_nwinkler
+```
+
+## Screenshot
+
+Here it is in action:
+
+![alt text](screenshot.png "Nwinkler Random Color Theme in Action!")
+
+## Usage Scenario
+
+This theme is especially useful when connecting to many different machines and switching between them often. Yes, the hostname *is* present in the prompt. But I argue that it's a lot faster to get a "feel" of what machine you are currently on because of the custom colors on that machine's prompt than by reading the hostname.
+

themes/nwinkler_random_colors/nwinkler_random_colors.theme.bash

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+#!/bin/bash
+
+# Two line prompt showing the following information:
+# (time) SCM [username@hostname] pwd (SCM branch SCM status)
+# →
+#
+# Example:
+# (14:00:26) ± [foo@bar] ~/.bash_it (master ✓)
+# →
+#
+# The arrow on the second line is showing the exit status of the last command:
+# * Green: 0 exit status
+# * Red: non-zero exit status
+#
+# The exit code functionality currently doesn't work if you are using the 'fasd' plugin,
+# since 'fasd' is messing with the $PROMPT_COMMAND
+
+RANDOM_COLOR_FILE=$HOME/.nwinkler_random_colors
+
+function randomize_nwinkler {
+  declare -a AVAILABLE_COLORS
+
+  AVAILABLE_COLORS=(
+    $black
+    $red
+    $green
+    $yellow
+    $blue
+    $purple
+    $cyan
+    $white
+    $orange
+    $bold_black
+    $bold_red
+    $bold_green
+    $bold_yellow
+    $bold_blue
+    $bold_purple
+    $bold_cyan
+    $bold_white
+    $bold_orange
+  )
+  # Uncomment these to allow underlines:
+    #$underline_black
+    #$underline_red
+    #$underline_green
+    #$underline_yellow
+    #$underline_blue
+    #$underline_purple
+    #$underline_cyan
+    #$underline_white
+    #$underline_orange
+  #)
+
+  USERNAME_COLOR=${AVAILABLE_COLORS[$RANDOM % ${#AVAILABLE_COLORS[@]} ]}
+  HOSTNAME_COLOR=${AVAILABLE_COLORS[$RANDOM % ${#AVAILABLE_COLORS[@]} ]}
+  TIME_COLOR=${AVAILABLE_COLORS[$RANDOM % ${#AVAILABLE_COLORS[@]} ]}
+  PATH_COLOR=${AVAILABLE_COLORS[$RANDOM % ${#AVAILABLE_COLORS[@]} ]}
+
+  echo "$USERNAME_COLOR,$HOSTNAME_COLOR,$TIME_COLOR,$PATH_COLOR," > $RANDOM_COLOR_FILE
+}
+
+if [ -f $RANDOM_COLOR_FILE ];
+then
+  # read the colors already stored in the file
+  IFS=',' read -ra COLORS < $RANDOM_COLOR_FILE
+  USERNAME_COLOR=${COLORS[0]}
+  HOSTNAME_COLOR=${COLORS[1]}
+  TIME_COLOR=${COLORS[2]}
+  PATH_COLOR=${COLORS[3]}
+else
+  # No colors stored yet. Generate them!
+  randomize_nwinkler
+
+  echo
+  echo "Looks like you are using the nwinkler_random_color bashit theme for the first time."
+  echo "Random colors have been generated to be used in your prompt."
+  echo "If you don't like them, run the command:"
+  echo "  randomize_nwinkler"
+  echo "until you get a combination that you like."
+  echo
+fi
+
+PROMPT_END_CLEAN="${green}→${reset_color}"
+PROMPT_END_DIRTY="${red}→${reset_color}"
+
+function prompt_end() {
+  echo -e "$PROMPT_END"
+}
+
+prompt_setter() {
+  local exit_status=$?
+  if [[ $exit_status -eq 0 ]]; then PROMPT_END=$PROMPT_END_CLEAN
+    else PROMPT_END=$PROMPT_END_DIRTY
+  fi
+  # Save history
+  history -a
+  history -c
+  history -r
+  PS1="(${TIME_COLOR}\t${reset_color}) $(scm_char) [${USERNAME_COLOR}\u${reset_color}@${HOSTNAME_COLOR}\H${reset_color}] ${PATH_COLOR}\w${reset_color}$(scm_prompt_info) ${reset_color}\n$(prompt_end) "
+  PS2='> '
+  PS4='+ '
+}
+
+PROMPT_COMMAND=prompt_setter
+
+SCM_THEME_PROMPT_DIRTY=" ${bold_red}✗${normal}"
+SCM_THEME_PROMPT_CLEAN=" ${bold_green}✓${normal}"
+SCM_THEME_PROMPT_PREFIX=" ("
+SCM_THEME_PROMPT_SUFFIX=")"
+RVM_THEME_PROMPT_PREFIX=" ("
+RVM_THEME_PROMPT_SUFFIX=")"