Ensure ascii only filenames. Fix #423.

gollum.gemspec

@@ -33,6 +33,7 @@ Gem::Specification.new do |s|
   s.add_dependency('sanitize', "~> 2.0.0")
   s.add_dependency('nokogiri', "~> 1.4")
   s.add_dependency('useragent', "~> 0.4.9")
+  s.add_dependency('stringex', "~> 1.4.0")
 
   s.add_development_dependency('RedCloth')
   s.add_development_dependency('mocha')

lib/gollum/frontend/app.rb

@@ -3,6 +3,7 @@ require 'sinatra'
 require 'gollum'
 require 'mustache/sinatra'
 require 'useragent'
+require 'stringex'
 
 require 'gollum/frontend/views/layout'
 require 'gollum/frontend/views/editable'
@@ -142,7 +143,7 @@ module Precious
     end
 
     post '/create' do
-      name         = params[:page]
+      name         = params[:page].to_ascii
       path         = sanitize_empty_params(params[:path])
       format       = params[:format].intern