moved SpiderProfiler extension to scrapy.contrib_exp and removed references from documentation

--HG--
rename : scrapy/contrib/spider/profiler.py => scrapy/contrib_exp/spiderprofiler.py

docs/topics/extensions.rst

@@ -165,7 +165,7 @@ how you :ref:`configure the downloader middlewares
             >>> extensions.load()
             >>> print extensions.disabled
             {'MemoryDebugger': 'scrapy.contrib.webconsole.stats.MemoryDebugger',
-             'SpiderProfiler': 'scrapy.contrib.spider.profiler.SpiderProfiler',
+             'MyExtension': 'myproject.extensions.MyExtension',
             ...
 
     .. method:: load()

docs/topics/settings.rst

@@ -838,16 +838,6 @@ A dict containing the scheduler middlewares enabled by default in Scrapy. You
 should never modify this setting in your project, modify
 :setting:`SCHEDULER_MIDDLEWARES` instead. 
 
-.. setting:: SPIDERPROFILER_ENABLED
-
-SPIDERPROFILER_ENABLED
-----------------------
-
-Default: ``False``
-
-Enable the spider profiler. Warning: this could have a big impact in
-performance.
-
 .. setting:: SPIDER_MIDDLEWARES
 
 SPIDER_MIDDLEWARES