Merge branch 'refs/heads/develop' into feature/unit-tests

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diff --git a/user_guide_src/source/general/profiling.rst b/user_guide_src/source/general/profiling.rst
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+##########################
+Profiling Your Application
+##########################
+
+The Profiler Class will display benchmark results, queries you have run,
+and $_POST data at the bottom of your pages. This information can be
+useful during development in order to help with debugging and
+optimization.
+
+Initializing the Class
+======================
+
+.. important:: This class does NOT need to be initialized. It is loaded
+	automatically by the :doc:`Output Class <../libraries/output>` if
+	profiling is enabled as shown below.
+
+Enabling the Profiler
+=====================
+
+To enable the profiler place the following function anywhere within your
+:doc:`Controller <controllers>` functions::
+
+	$this->output->enable_profiler(TRUE);
+
+When enabled a report will be generated and inserted at the bottom of
+your pages.
+
+To disable the profiler you will use::
+
+	$this->output->enable_profiler(FALSE);
+
+Setting Benchmark Points
+========================
+
+In order for the Profiler to compile and display your benchmark data you
+must name your mark points using specific syntax.
+
+Please read the information on setting Benchmark points in :doc:`Benchmark
+Class <../libraries/benchmark>` page.
+
+Enabling and Disabling Profiler Sections
+========================================
+
+Each section of Profiler data can be enabled or disabled by setting a
+corresponding config variable to TRUE or FALSE. This can be done one of
+two ways. First, you can set application wide defaults with the
+application/config/profiler.php config file.
+
+::
+
+	$config['config']          = FALSE;
+	$config['queries']         = FALSE;
+
+In your controllers, you can override the defaults and config file
+values by calling the set_profiler_sections() method of the :doc:`Output
+class <../libraries/output>`::
+
+	$sections = array(
+	    'config'  => TRUE,
+	    'queries' => TRUE
+	    );
+
+	$this->output->set_profiler_sections($sections);
+
+Available sections and the array key used to access them are described
+in the table below.
+
+======================= =================================================================== ========
+Key                     Description                                                         Default
+======================= =================================================================== ========
+**benchmarks**          Elapsed time of Benchmark points and total execution time           TRUE
+**config**              CodeIgniter Config variables                                        TRUE
+**controller_info**     The Controller class and method requested                           TRUE
+**get**                 Any GET data passed in the request                                  TRUE
+**http_headers**        The HTTP headers for the current request                            TRUE
+**memory_usage**        Amount of memory consumed by the current request, in bytes          TRUE
+**post**                Any POST data passed in the request                                 TRUE
+**queries**             Listing of all database queries executed, including execution time  TRUE
+**uri_string**          The URI of the current request                                      TRUE
+**session_data**        Data stored in the current session                                  TRUE
+**query_toggle_count**  The number of queries after which the query block will default to   25
+                        hidden.
+======================= =================================================================== ========
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