Clean up and add a few more entries to .gitignore

.gitignore

@@ -1,10 +1,19 @@
-*.in
+# http://www.gnu.org/software/automake
-aclocal.m4
+Makefile.in
-autom4te.cache
+# http://www.gnu.org/software/autoconf
-compile
+/autom4te.cache
-configure
+/aclocal.m4
-config.guess
+/compile
-config.sub
+/configure
-depcomp
+/depcomp
-install-sh
+/install-sh
-missing
+/missing
+
+# Dependency files
+.deps
+
+# Object files and libraries
+*.o
+*.a
+