Removed Wire.endTransmission() for Arduino >1

Wire.requestFrom() will already send a STOP thus releasing the bus. (I also tried to keep the bus, so reads greater than the TWI/Wire buffer size would be simpler to write, but that didn't work yet.)

The removed Wire.endTransmission() started a new transmission by sending a START + ADDRESS and would send a STOP after receiving ACK. Without it you'll save a few microseconds.

readBytes() tested with the MPU-6050 DMP example on UNO using Arduino IDEs 1.0.1, 1.0.5 and 1.5.2.
readWords() tested with a simple demo for UNO reading values from another Arduino. IDE 1.5.2 was used.

Arduino/I2Cdev/I2Cdev.cpp

@@ -293,8 +293,6 @@ int8_t I2Cdev::readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8
                         if (count + 1 < length) Serial.print(" ");
                     #endif
                 }
-
-                Wire.endTransmission();
             }
         #endif
 
@@ -451,8 +449,6 @@ int8_t I2Cdev::readWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint1
                     }
                     msb = !msb;
                 }
-
-                Wire.endTransmission();
             }
         #endif