Move graph module from lib or vendor directory to app directory.

Because not autoloading lib directory at development mode.

app/models/graph/commit.rb

@@ -0,0 +1,50 @@
+require "grit"
+
+module Graph
+  class Commit
+    include ActionView::Helpers::TagHelper
+
+    attr_accessor :time, :space, :refs, :parent_spaces
+
+    def initialize(commit)
+      @_commit = commit
+      @time = -1
+      @space = 0
+      @parent_spaces = []
+    end
+
+    def method_missing(m, *args, &block)
+      @_commit.send(m, *args, &block)
+    end
+
+    def to_graph_hash
+      h = {}
+      h[:parents] = self.parents.collect do |p|
+        [p.id,0,0]
+      end
+      h[:author]  = {
+        name: author.name, 
+        email: author.email
+      }
+      h[:time]    = time
+      h[:space]   = space
+      h[:parent_spaces]   = parent_spaces
+      h[:refs]    = refs.collect{|r|r.name}.join(" ") unless refs.nil?
+      h[:id]      = sha
+      h[:date]    = date
+      h[:message] = message
+      h
+    end
+
+    def add_refs(ref_cache, repo)
+      if ref_cache.empty?
+        repo.refs.each do |ref|
+          ref_cache[ref.commit.id] ||= []
+          ref_cache[ref.commit.id] << ref
+        end
+      end
+      @refs = ref_cache[@_commit.id] if ref_cache.include?(@_commit.id)
+      @refs ||= []
+    end
+  end
+end