Updated all plugins that are non-forked. Added some new plugins.

Added update_plugins.py which can fetch new plugins from GitHub.

New plugins added: zencoding, vim-indent-object, taglist, nginx.vim

sources_non_forked/snipmate-snippets/ruby-rspec/mat.snippet

@@ -0,0 +1,24 @@
+class ${1:ReverseTo}
+	def initialize(${2:param})
+		@$2 = $2
+	end
+
+	def matches?(actual)
+		@actual = actual
+		# Satisfy expectation here. Return false or raise an error if it's not met.
+		${3:@actual.reverse.should == @$2}
+		true
+	end
+
+	def failure_message
+		"expected #{@actual.inspect} to ${4} #{@$2.inspect}, but it didn't"
+	end
+
+	def negative_failure_message
+		"expected #{@actual.inspect} not to ${5} #{@$2.inspect}, but it did"
+	end
+end
+
+def ${6:reverse_to}(${7:expected})
+	${8}.new($7)
+end