Add db/*.sqlite3-journal to .gitignore

These can pop up while the SQLite DB is being written to.

railties/lib/rails/generators/rails/app/templates/gitignore

@@ -9,6 +9,7 @@
 
 # Ignore the default SQLite database.
 /db/*.sqlite3
+/db/*.sqlite3-journal
 
 # Ignore all logfiles and tempfiles.
 /log/*.log

railties/lib/rails/generators/rails/plugin_new/templates/gitignore

@@ -2,6 +2,7 @@
 log/*.log
 pkg/
 <%= dummy_path %>/db/*.sqlite3
+<%= dummy_path %>/db/*.sqlite3-journal
 <%= dummy_path %>/log/*.log
 <%= dummy_path %>/tmp/
 <%= dummy_path %>/.sass-cache