anytransceiver pseudomodule
enable avsextrem anytransceiver
Change module name to defaulttransceiver

addresses https://github.com/RIOT-OS/RIOT/pull/609#issuecomment-35160699
fixup from rebase
update test_net_if for defaulttransceiver
update test_pnet for defaulttransceiver
add Makefile.pseudomodules and use it

BASELIBS now defines targets for anything in USEMODULE that is not in PSEUDOMODULES