This will make the tutorial a bit easier.

Verilator wants this.  It's a hack to make things compile, but it'll
work for the demo (I think).  This is fixed for real upstream.

This is very big and won't be used for the tutorial.

This allows the tests to find the SMI example's address.

This avoids hard-coding the size of the example multiple times.

If I pass this "init" here, then Chisel 3 will silently generate bad
FIRRTL.

These failed for Andrew earlier.  While it might be paranioa, there's
really no reason to build the man pages so we might as well not bother.

Default to Chisel 3

Now that we can test Chisel 3 on Travis, I think it's time to turn it on
for everyone else.

Now that we have verilator support we can start testing the Chisel 3
Verilog on Travis.  This disables Chisel 2 Travis tests because they're
too slow.

We need a fairly new version of Verilator, so I just added a rule to
download and install it on all systems.

If you have multi-target rules that don't have %s in them, make
interprets that as "run this recipe multiple times, once to produce each
target".  If you have %s in the rules, then make interprets it as "run
this recipe once to produce all targets".  We want the second one.

See the cooresponding uncore commit for details.

English major I'm not, but my sister was and she says 'who' is correct here

This reverts commit ff2937a7.

This was just a missing Makefrag-verilog dependency (the .d file).