add file verifications

Rakefile

@@ -5,13 +5,15 @@ require 'rake/clean'
 # =================
 
 # main name used if filename
-target = IO.read("name").chomp
+target = IO.read("name").split("\n")[0]
+raise "define project name in 'name' file" unless target
 # schema
 sch = "#{target}.sch"
 # pcb layout
 pcb = "#{target}.pcb"
 # project version, read from "version" file
-version = IO.read("version").chomp
+version = IO.read("version").split("\n")[0]
+raise "define project version in 'version' file" unless version
 # current date for stamping output
 date = Time.now.strftime("%Y-%m-%d")
 # schematic revision, based on the number of schematic commits)