Force a specific shell to be used (ref #59)

This allows us to use options to echo that in turn allow it to interpret
the tab escape sequence.  Some systems would be using other shells by default,
so this should make the environment more consistant.

Makefile

@@ -10,6 +10,8 @@ all:    list_laptops
 
 .PHONY: all
 
+SHELL = /bin/bash
+
 QEMU_OPTIONS ?= -enable-kvm
 
 GITVERSION = $(shell git describe --dirty --abbrev=6 ) ($(shell date +%Y%m%d))
@@ -22,7 +24,7 @@ list_laptops:
 	$(info The following make targets are the supported usb images:)
 	$(info )
 	@for i in $(LIST_PATCHED); do \
-            echo "$$i.img\t- `scripts/describe $$i.iso`"; \
+            echo -e "$$i.img\t- `scripts/describe $$i.iso`"; \
 	done
 	@echo