expose glob method directly to Rsconscript - close #97

build_tests/direct/c_program.rb

@@ -1,5 +1,5 @@
 build do
   Environment.new do |env|
-    env.Program("test.exe", Rscons.glob("*.c"), direct: true)
+    env.Program("test.exe", glob("*.c"), direct: true)
   end
 end