Add --collapse-tree command line option

lib/gollum/frontend/app.rb

@@ -332,7 +332,7 @@ module Precious
       wiki = Gollum::Wiki.new(settings.gollum_path, settings.wiki_options)
       show_all = settings.wiki_options[:show_all]
       # if showing all files include wiki.files
-      @results = show_all ? Gollum::FileView.new(wiki.pages + wiki.files, show_all).render_files :
+      @results = show_all ? Gollum::FileView.new(wiki.pages + wiki.files, settings.wiki_options).render_files :
                             Gollum::FileView.new(wiki.pages).render_files
       @ref = wiki.ref
       mustache :file_view, { :layout => false }

lib/gollum/wiki.rb

@@ -156,6 +156,7 @@ module Gollum
     #           :mathjax       - Set to false to disable mathjax.
     #           :show_all      - Show all files in file view, not just valid pages.
     #                            Default: false
+    #           :collapse_tree - Start with collapsed file view. Default: false
     #
     # Returns a fresh Gollum::Repo.
     def initialize(path, options = {})
@@ -183,6 +184,7 @@ module Gollum
       @universal_toc = options.fetch(:universal_toc, false)
       @mathjax = options[:mathjax] || false
       @show_all = options[:show_all] || false
+      @collapse_tree = options[:collapse_tree] || false
     end
 
     # Public: check whether the wiki's git repo exists on the filesystem.