Prep for resuming work.

--HG--
rename : ext/connection.c => ext/openldap_ext/connection.c
rename : ext/extconf.rb => ext/openldap_ext/extconf.rb
rename : ext/openldap.c => ext/openldap_ext/openldap.c
rename : ext/openldap.h => ext/openldap_ext/openldap.h