added min and sec aliases to minutes and seconds

methods respectively to Numeric for unit
consitency

lib/time_ext.rb

@@ -5,3 +5,4 @@ require 'time_ext/calculations'
 require 'time_ext/iterations'
 require 'time_ext/support'
 require 'time_ext/core_ext/time'
+require 'time_ext/core_ext/numeric'

lib/time_ext/core_ext/numeric.rb

@@ -0,0 +1,4 @@
+class Numeric
+  alias :sec :seconds
+  alias :min :minutes
+end