#240 Made Wire receiveFrom stopMaster() optional

[majenkotech]

This adds an optional boolean parameter to Wire.requestFrom() which then is used to wrap the di2c.stopMaster() call to make executing it optional.

[majenkotech]

BEFORE MERGING THIS NEEDS TESTING BY SOMEONE WITH A SUITABLE SETUP

I don't have a setup that needs this functionality at the moment and can't test the knock-on effect of it. If someone that has a setup that would use this parameter could test it before merging that would be a huge benefit.

[majenkotech]

Potential fix for issue #240

[EmbeddedMan]

What is required to test that this change works? Generating a request to an I2C slave in multiple parts without a stop in between each requestFrom() except the last?

[majenkotech]

Yeah, with some device that expects to work that way.

[EmbeddedMan]

If such a device can be identified, I may be able to test.

[majenkotech]

I have a feeling things like EEPROMS may work this way. First set an address, then read from that address without restarting.