#395 update the mimetype of composer.json to pure json type

Author: Li

src/packagedcode/phpcomposer.py

@@ -51,7 +51,7 @@
 class PHPComposerPackage(models.Package):
     metafiles = ('composer.json')
     filetypes = ('.json',)
-    mimetypes = ('application/x-directory', 'text/directory', 'inode/directory')
+    mimetypes = ('application/json')
     repo_types = (models.repo_phpcomposer,)
 
     type = models.StringType(default='phpcomposer')