Restrict to just py3.4.1 testing on travis for now.
Trying to fix spglib.
Some fixes for spglib.
Revert "Some fixes for spglib."

This reverts commit 0566415faa72bf3ef7e4fd5d6e1a34607b2c658a.
Revert "Restrict to just py3.4.1 testing on travis for now."

This reverts commit 4cb5cdc0a5e1a89313db09dc47cd260c5bc94554.
Try using extra_compile_args to disable py3.4's irritating gcc message.
Merge branch 'pmg3' into stable_py3