Adding version file

Follow the standard structure of having a version.rb file

lib/liquid.rb

@@ -45,6 +45,7 @@ module Liquid
   VariableParser              = /\[[^\]]+\]|#{VariableSegment}+\??/o
 end
 
+require "liquid/version"
 require 'liquid/drop'
 require 'liquid/extensions'
 require 'liquid/errors'

lib/liquid/version.rb

@@ -0,0 +1,4 @@
+# encoding: utf-8
+module Liquid
+  VERSION = "2.5.0"
+end

liquid.gemspec

@@ -1,8 +1,12 @@
 # encoding: utf-8
+lib = File.expand_path('../lib/', __FILE__)
+$:.unshift lib unless $:.include?(lib)
+
+require "liquid/version"
 
 Gem::Specification.new do |s|
   s.name        = "liquid"
-  s.version     = "2.5.0"
+  s.version     = Liquid::VERSION
   s.platform    = Gem::Platform::RUBY
   s.summary     = "A secure, non-evaling end user template engine with aesthetic markup."
   s.authors     = ["Tobias Luetke"]