Added gemspec for automatic rubygem github madness

liquid.gemspec

@@ -0,0 +1,13 @@
+Gem::Specification.new do |s|
+  s.name = "liquid"
+  s.version = "1.9.0"
+  s.date = "2008-06-23"
+  s.description = s.summary = "A secure non evaling end user template engine with aesthetic markup."
+  s.email = "tobi@leetsoft.com"
+  s.homepage = "http://www.liquidmarkup.org"
+  s.has_rdoc = true
+  s.authors = ["Tobias Lütke"]
+  p s.files  = File.read('Manifest.txt').to_a.collect { |f| f.strip }
+  s.rdoc_options = ["--main", "README.txt"]
+  s.extra_rdoc_files = ["History.txt", "Manifest.txt", "README.txt"]
+end