ChangeLog: * OpenWrt:Update to 15.05 * OpenWrt:Support Raspberry Pi 2 Model B * LuCI:Sync with for-15.05 branch (ab31abd244979d1ff234a15a4a3cf69ac1b73688) * CGMiner:Sync with ckolivas's master (5a456afbfa028162060afd66636b7cb266b35a53) * CGMiner:Add more options for smartspeed (Only support MM version >= 601512-xxxxxxxx)