Remove externs target from the Rakefile

We are not going to do advanced optimization in the forseeable
future, so until then we don't need we should remove them from
Rakefile.

Rakefile

@@ -51,25 +51,6 @@ task :clean do
 end
 
 
-desc 'Generate Externs'
-task :compile_externs do
-  File.open('externs.js', 'w') do |out|
-    out.write("function jQuery(){};\n")
-
-    File.open('lib/jquery/jquery-1.4.2.js', 'r') do |file|
-      while (line = file.gets)
-        if line =~ /^\s*(\w+)\s*:\s*function.*$/
-          out.write("jQuery.#{$1}=function(){};\n")
-        end
-      end
-    end
-
-    out.write("jQuery.scope=function(){};\n")
-    out.write("jQuery.controller=function(){};\n")
-  end
-end
-
-
 desc 'Compile Scenario'
 task :compile_scenario do
   
@@ -150,7 +131,7 @@ end
 
 
 desc 'Compile JavaScript'
-task :compile => [:compile_externs, :compile_scenario, :generate_ie_compat] do
+task :compile => [:compile_scenario, :generate_ie_compat] do
 
   deps = [
       'src/angular.prefix',
@@ -167,7 +148,6 @@ task :compile => [:compile_externs, :compile_scenario, :generate_ie_compat] do
   %x(java -jar lib/compiler-closure/compiler.jar \
         --compilation_level SIMPLE_OPTIMIZATIONS \
         --js angular-debug.js \
-        --externs externs.js \
         --create_source_map ./angular-minified.map \
         --js_output_file angular-minified.js)
 end