Add .gitignore

.gitignore

@@ -0,0 +1,19 @@
+*~
+master/nightly*
+master/auto*
+master/dist*
+master/try*
+master/snap3*
+master/buildbot.tac
+master/gitpoller*
+master/http.log
+master/master.cfg.txt
+master/master.cfg.sample
+master/public_html
+master/runtests
+master/slave-list.txt
+master/state.sqlite
+master/twistd.log
+master/twistd.pid
+rust-bot-privkey.pem
+