add controller packet_in meter execution
add support for linux 3 PBB TPID

TP_STATUS_VLAN_VALID was introduced in newer linux
kernel.
remove sqlite3 dependency

It seems ok to remove sqlite3 dependency because it is not
used by any components.
Merge pull request #131 from iHiroakiKawai/rm_sqlite

remove sqlite3 dependency
Merge pull request #130 from iHiroakiKawai/vlan_tpid_pbb

add support for linux 3 PBB TPID
Merge pull request #129 from iHiroakiKawai/ctrl_meter

add controller escalation rate limit
Bundle pio (Fixes #88).
Rename Trema::Logger -> Trema::TremaLogger to avoid name clinfcts with Sinatra's Logger (fixes #54).
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