Add files used by eww to .gitignore.

Author: ahyatt

.gitignore

@@ -7,12 +7,14 @@ eproject.lst
 \#*
 .places
 .cache
+/eww-bookmarks
 eshell/history
 .emacs.desktop
 .emacs.desktop.lock
 eshell/alias
 eshell/lastdir
 /url/cookies
+/url/cache
 my-org/
 org-files/
 semanticdb/
@@ -33,6 +35,7 @@ tmp/
 /history
 .python-environments/
 server/
+/network-security.data
 *~
 *.elc
 *.pyc