Add rake task to generate man page

Rakefile

@@ -32,3 +32,9 @@ task :console do
   ARGV.clear
   Hbc.pry
 end
+
+desc 'Generate man page from Markdown source'
+task :man do
+  sh 'ronn --roff --pipe --organization=Homebrew-cask --manual=brew-cask ' \
+     'doc/src/brew-cask.1.md > man/man1/brew-cask.1'
+end

developer/bin/generate_man_pages

@@ -1,55 +0,0 @@
-#!/bin/bash
-#
-# generate_man_pages
-#
-# This is temporary, should be replaced with a Rakefile target
-#
-
-###
-### settings
-###
-
-set -e                # exit on uncaught error
-set +o histexpand     # don't expand history expressions
-shopt -s nocasematch  # case-insensitive regular expressions
-
-###
-### functions
-###
-
-warn () {
-    local message="$@"
-    message="${message//\\t/$'\011'}"
-    message="${message//\\n/$'\012'}"
-    message="${message%"${message##*[![:space:]]}"}"
-    printf "%s\n" "$message" 1>&2
-}
-
-die () {
-    warn "$@"
-    exit 1
-}
-
-cd_to_project_root () {
-    local script_dir="$(/usr/bin/dirname "$0")"
-    cd "$script_dir"
-    local git_root="$(git rev-parse --show-toplevel)"
-    if [[ -z "$git_root" ]]; then
-        die "ERROR: Could not find git project root"
-    fi
-    cd "$git_root"
-}
-
-###
-### main
-###
-
-cd_to_project_root
-
-if ! /usr/bin/which ronn >/dev/null 2>&1; then
-    die "ERROR: The 'ronn' gem must be installed"
-fi
-
-ronn --roff --pipe --organization='Homebrew-cask' --manual='brew-cask' doc/src/brew-cask.1.md > man/man1/brew-cask.1
-
-#