Big Control

• add unitTextSize to all speedometers.
• add trembleDegree and trembleDuration Attributes.
• Control at the beginning and end of the Speedometer, using startDegree and endDegree Attributes, or setStartDegree(int) setEndDegree(int) methods.
• Control division of the speedometer, now you can change the long of lowSpeed and mediumSpeed segments, using lowSpeedPercent and mediumSpeedPercent Attributes, or setLowSpeedPercent(int) setMediumSpeedPercent(int) methods, issue #8 .
• support Right to Left Text, speedometerTextRightToLeft Attribute or setspeedometerTextRightToLeft(boolean) method.
• save 20% CPU usage.
• Relying on memory, which means few processes on UI thread.
• one speedometer may take [1 to 2] MB on memory.