Add .gitignore

Fixes #9

Signed-off-by: David Goulet <dgoulet@ev0ke.net>

.gitignore

+*.o
+*.so
+*.swp
+*.o
+*.swo
+*.pyc
+Makefile
+.libs/
+.deps/
+*~
+*.la
+*.lo
+Makefile.in
+*.loT
+*.info
+*.gz
+*.tar
+.dirstamp
+configure
+aclocal.m4
+autom4te.cache/
+config.h
+config.h.in
+config.log
+config.status
+stamp-h1
+libtool
+tags
+
+# m4 macros not automatically generated
+/config/
+
+libotr.pc
+
+/toolkit/otr_mackey
+/toolkit/otr_modify
+/toolkit/otr_parse
+/toolkit/otr_readforge
+/toolkit/otr_remac
+/toolkit/otr_sesskeys