recognize jl extension as jsonlines exporter and update docs

docs/faq.rst

@@ -201,15 +201,15 @@ Simplest way to dump all my scraped items into a JSON/CSV/XML file?
 
 To dump into a JSON file::
 
-    scrapy crawl myspider -o items.json -t json
+    scrapy crawl myspider -o items.json
 
 To dump into a CSV file::
 
-    scrapy crawl myspider -o items.csv -t csv
+    scrapy crawl myspider -o items.csv
 
 To dump into a XML file::
 
-    scrapy crawl myspider -o items.xml -t xml
+    scrapy crawl myspider -o items.xml
 
 For more information see :ref:`topics-feed-exports`
 

docs/intro/overview.rst

@@ -155,7 +155,7 @@ Run the spider to extract the data
 Finally, we'll run the spider to crawl the site and output the file
 ``scraped_data.json`` with the scraped data in JSON format::
 
-    scrapy crawl mininova -o scraped_data.json -t json
+    scrapy crawl mininova -o scraped_data.json
 
 This uses :ref:`feed exports <topics-feed-exports>` to generate the JSON file.
 You can easily change the export format (XML or CSV, for example) or the

docs/intro/tutorial.rst

@@ -426,7 +426,7 @@ Storing the scraped data
 The simplest way to store the scraped data is by using the :ref:`Feed exports
 <topics-feed-exports>`, with the following command::
 
-    scrapy crawl dmoz -o items.json -t json
+    scrapy crawl dmoz -o items.json
 
 That will generate a ``items.json`` file containing all scraped items,
 serialized in `JSON`_.

scrapy/settings/default_settings.py

@@ -136,6 +136,7 @@ FEED_EXPORTERS = {}
 FEED_EXPORTERS_BASE = {
     'json': 'scrapy.contrib.exporter.JsonItemExporter',
     'jsonlines': 'scrapy.contrib.exporter.JsonLinesItemExporter',
+    'jl': 'scrapy.contrib.exporter.JsonLinesItemExporter',
     'csv': 'scrapy.contrib.exporter.CsvItemExporter',
     'xml': 'scrapy.contrib.exporter.XmlItemExporter',
     'marshal': 'scrapy.contrib.exporter.MarshalItemExporter',