Added script for quick installation of the app and templates

Added install-appledoc.sh script that can be used to quickly install
appledoc. It can be invoked from terminal with "sudo sh
install-appledoc.sh" command. By default, it installs binary to
/usr/local/bin and templates to ~/.appledoc. This directories can be
overridden with -b and -t options respectively.

install-appledoc.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+
+BINARY_DIR=/usr/local/bin/
+TEMPLATES_DIR=~/.appledoc
+
+usage() {
+cat <<EOF
+Usage: $0 [-b binary_path] [-t templates_path]
+
+Builds and installs appledoc
+
+OPTIONS:
+    -b  Path where binary will be installed. Default is $BINARY_DIR
+    -t  Path where templates will be installed. Default is $TEMPLATES_DIR
+    
+EOF
+}
+
+while getopts "hb:t:" OPTION
+do
+	case $OPTION in
+		h) usage
+		   exit 0;;
+		b) 
+		   BINARY_DIR=$OPTARG;;
+		t) 
+		   TEMPLATES_DIR=$OPTARG;;
+		[?])
+			usage
+			exit 1;;
+	esac
+done
+
+echo "Building..."
+xcodebuild -target appledoc -configuration Release install
+
+echo "Installing binary to $BINARY_DIR"
+cp /tmp/appledoc.dst/usr/local/bin/appledoc $BINARY_DIR
+
+echo "Copying temapltes to $TEMPLATES_DIR"
+cp -R Templates $TEMPLATES_DIR