Update .gitignore, add bogus m4/.gitignore to make Travis-CI happy

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

.gitignore

@@ -1,5 +1,21 @@
+*~
 *.d
 *.o
 *.so
 *.so.*
 *.a
+.deps
+compile
+config.*
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+stamp-h1
+Makefile
+Makefile.in
+aclocal.m4
+ar-lib
+autom4te.cache

m4/.gitignore

@@ -0,0 +1 @@
+*.m4