Replace unnecessary float math in elapsedSeconds with integer math Thanks to @EeroFluge for spotting this. elapsedSeconds as introduced in the last revision used float math, which added unnecessary overhead and increased compile file size.
Replace unnecessary float math in elapsedSeconds with integer math
Thanks to @EeroFluge for spotting this. elapsedSeconds as introduced
in the last revision used float math, which added unnecessary
overhead and increased compile file size.

With this change, compiling the blinkingTests example for the
Arduino Uno board has gone from ...

```
RAM:   [          ]   1.6% (used 33 bytes from 2048 bytes)
Flash: [=         ]   8.0% (used 2588 bytes from 32256 bytes)
```

... to ...

```
RAM:   [          ]   1.6% (used 33 bytes from 2048 bytes)
Flash: [=         ]   5.5% (used 1786 bytes from 32256 bytes)
```

... a clear saving of 802 bytes in one fell swoop!

pfeerick/elapsedMillis