Merge branch 'release0.3.8' into develop
Add 'trema1' postfix to vendor/vendor/oflops-0.03 and its tar.gz to clearify that it is modified for trema (refs #255)
Make openvswitch 1.2.2 search librt for POSIX timer functions

This fix updates Open vSwitch tarball distributed with Trema.

Fixes #255
Rename .patch -> .diff (refs #256)
Merge pull request #256 from amotoki/ovs-librt-search

Make openvswitch 1.2.2 search librt for POSIX timer functions
Add 'trema port_up' command.

See features/trema_commands/port_up.feature for its usage and
details (refs #253).
Merge branch 'develop' of https://github.com/trema/trema into develop
Version bump to 0.3.9
Merge branch 'release0.3.9'