Add rainbowbrite theme

Looks like:
± ~/path/to (branch ✓) $

in glorious red / blue / yellow color scheme

themes/rainbowbrite/rainbowbrite.theme.bash

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# based off of n0qorg
+# looks like, if you're in a git repo:
+# ± ~/path/to (branch ✓) $
+# in glorious red / blue / yellow color scheme
+
+prompt_setter() {
+  # Save history
+  history -a
+  history -c
+  history -r
+  # displays user@server in purple
+  # PS1="\[$red\]$(scm_char) \[$purple\]\u@\h\[$reset_color\]:\[$blue\]\w\[$yellow\]$(scm_prompt_info)$(rvm_version_prompt) \[$black\]$\[$reset_color\] "
+  # no user@server
+  PS1="\[$red\]$(scm_char) \[$blue\]\w\[$yellow\]$(scm_prompt_info)$(rvm_version_prompt) \[$black\]$\[$reset_color\] "
+  PS2='> '
+  PS4='+ '
+}
+
+PROMPT_COMMAND=prompt_setter
+
+SCM_THEME_PROMPT_DIRTY=" ✗"
+SCM_THEME_PROMPT_CLEAN=" ✓"
+SCM_THEME_PROMPT_PREFIX=" ("
+SCM_THEME_PROMPT_SUFFIX=")"
+RVM_THEME_PROMPT_PREFIX=" ("
+RVM_THEME_PROMPT_SUFFIX=")"