Low-rent guard support

Guardfile

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+require 'guard/guard'
+
+module ::Guard
+  class Micronaut < ::Guard::Guard
+    def run_all
+      system "rake" 
+    end
+
+    def run_on_change(paths)
+      system "ruby -Ilib -Ispec #{paths.join(' ')}" 
+    end
+  end
+end
+
+# A sample Guardfile
+# More info at https://github.com/guard/guard#readme
+# guard :tests do
+#   watch('*.rb')     { |m| `ruby -Ilib -Ispec spec/lib/#{m[1]}_spec.rb` }
+# end
+guard :micronaut do
+  watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
+  watch(%r{^spec/(.+)\.rb$})     { |m| m }
+end