expand .gitignore (Thanks madroach)

.gitignore

@@ -1 +1,19 @@
 *.o
+i3
+i3-input/i3-input
+i3-msg/i3-msg
+include/loglevels.h
+loglevels.tmp
+src/*.output
+src/*.tab.*
+src/*.yy.c
+man/i3-msg.1
+man/i3-msg.xml
+man/i3-msg.html
+man/i3-wsbar.1
+man/i3-wsbar.xml
+man/i3-wsbar.html
+man/i3.1
+man/i3.xml
+man/i3.html
+tags