Don't while(1) in loop()

[GaryBoone]

A small fix for the compass demo:

void loop()
{
    while(1) {
        ...

The while(1) isn't necessary and blocks other background processing. The loop function will be called repeatedly.

[Douglas Thain]

Sure, go ahead and make a PR.

[Douglas Thain]

Also fixed in v1.0.8, thanks.