Moving default Source to cocoapods gem

Removed private helper for master repo

lib/cocoapods-core/podfile.rb

@@ -99,12 +99,7 @@ def dependencies
     # @return [Array<String>] all the specs source names.
 
     def sources
-      sources = get_hash_value('sources')
-      unless sources
-        return [default_source]
-      else
-        sources
-      end
+      get_hash_value('sources')
     end
 
     # @return [String] the path of the workspace if specified by the user.
@@ -308,12 +303,6 @@ def self.from_hash(hash, path = nil)
 
     # @!group Private helpers
 
-    # @return [String] the default specs source name
-    #
-    def default_source
-      "master"
-    end
-
     # @return [Hash] The hash which store the attributes of the Podfile.
     #
     attr_accessor :internal_hash

spec/podfile_spec.rb

@@ -119,15 +119,6 @@ module Pod
       end
 
       describe "source" do
-
-        it 'always has at least one source' do
-          Podfile.new {}.sources.should.include "master"
-
-          Podfile.new do
-            source 'new_repo'
-          end.sources.should.include "new_repo"
-        end
-
         it 'can have multiple sources' do
           Podfile.new do
             source 'new_repo_1'