Add scrapy plugin

plugins/scrapy/README.md

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+## Scrapy zsh completion
+
+Auto completion for scrapy command-line tool
+
+#### commands
+
+``` 
+scrapy [tab]
+
+scrapy commands
+check         -- Check spider contracts,
+crawl         -- Run a spider,
+edit          -- Edit spider,
+fetch         -- Fetch a URL using the Scrapy downloader,
+genspider     -- Generate new spider using pre-defined templates,
+list          -- List available spiders,
+parse         -- Parse URL (using its spider) and print the results,
+runspider     -- Run a self-contained spider (without creating a project),
+settings      -- Get settings values,
+shell         -- Interactive scraping console,
+startproject  -- Create new project,
+version       -- Print Scrapy version,
+view          -- Open URL in browser, as seen by Scrapy
+```
+
+if check/crawl/edit is chosen 
+
+```
+scrapy check [tab]
+dmoz
+```
+
+spiders are listed.

plugins/scrapy/_scrapy

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+#compdef scrapy
+
+# zsh completion for the Scrapy command-line tool
+
+_scrapy() {
+    local curcontext="$curcontext" cmd spiders
+    typeset -A opt_args
+    cmd=$words[2]
+
+    local -a _1st_arguments
+    _1st_arguments=(
+        "check":"Check spider contracts",
+        "crawl":"Run a spider",
+        "edit":"Edit spider",
+        "fetch":"Fetch a URL using the Scrapy downloader",
+        "genspider":"Generate new spider using pre-defined templates",
+        "list":"List available spiders",
+        "parse":"Parse URL (using its spider) and print the results",
+        "runspider":"Run a self-contained spider (without creating a project)",
+        "settings":"Get settings values",
+        "shell":"Interactive scraping console",
+        "startproject":"Create new project",
+        "version":"Print Scrapy version",
+        "view":"Open URL in browser, as seen by Scrapy"
+    )
+    
+    case "$cmd" in
+        crawl|edit|check)
+            spiders=$(scrapy list 2>/dev/null) || spiders=""
+            if [[ -n "$spiders" ]]; then
+                compadd `echo $spiders`
+            fi
+        ;;
+        *)
+            if [[ CURRENT -eq 2 ]]; then
+                _describe -t commands "scrapy commands" _1st_arguments
+            fi
+        ;;
+    esac
+}
+
+_scrapy