Also moved it to be before getCodeWordB, so the getCodeWord* methods
are now sorted alphabetically.

Overall, the RCSwitch code is a mess when it comes to uniform
formatting; but overall, it seems using 2 space indention is
predominant, so let's try to make sure new code uses that, and slowly
migrate existing code to use it.

Some compilers rightfully complain about this; it could also fool
somebody into thinking a string was returned, when in reality
that's not the case.

The new code is smaller and faster and perhaps also easier to understand

fix 2 bugs introduced in PR #35

Test case:
https://gist.github.com/vgheo/f34ac7afd6447b3f1fc4

Iterate over all defined protocols in `handleInterrupt`

Travis integration + Readme changes

Fixed a dumb error (duplicate lines)

So far, while decoding the timings, the `handleInterrupt`routine only
iterated over protocols 1-3 before failing.

This small change will iterate over *all* protocols that have been
defined.

Tweak initial high signal of protocol 3

This resolves issue #32 (with a recent Globaltronics GT-FSI-07), and also is necessary
for compatibility with my Brennenstuhl RCS 2044.

Adds compilation support for Raspberry Pi

Resolves #8

Protocols as structs

Various minor improvements and cleanups

This results in much smaller and more efficient machine code.

It should not affect correctness, either: Indeed, the delay value
is computed from dividing an int by another int, so it fits into an int.
The delayTolerance is a fraction of that int, so it also fits.
Intermediate results like delay * pro.zero.high are ints because they
are equal to
 timings[0] * pro.zero.high / pro.syncFactor.low
but syncfactor.low is always larger (at least in all current protocols)
than any other high/low value.