Implement --nameattr option

[jasonrhansen]

Implements #24

[codecov-io]

Codecov Report

Merging #39 into master will increase coverage by 40.53%.
The diff coverage is 89.94%.

@@             Coverage Diff             @@
##           master      #39       +/-   ##
===========================================
+ Coverage   41.81%   82.35%   +40.53%     
===========================================
  Files           7        9        +2     
  Lines         672      867      +195     
===========================================
+ Hits          281      714      +433     
+ Misses        391      153      -238

Impacted Files	Coverage Δ
tests/collapse-perf.rs	93.61% <ø> (ø)
src/bin/flamegraph.rs	0% <0%> (ø)	⬆️
src/flamegraph/mod.rs	84.07% <100%> (+84.07%)	⬆️
tests/flamegraph-nameattr.rs	86.95% <86.95%> (ø)
src/flamegraph/attrs.rs	89.74% <89.74%> (ø)
src/flamegraph/merge.rs	84.84% <0%> (+84.84%)	⬆️
src/flamegraph/svg.rs	98.36% <0%> (+98.36%)	⬆️

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[jonhoo]

This looks pretty good! I think I'd like to see a test that actually passes in a nameattr file and checks the SVG output that those attributes are actually there, but that's my only major piece of feedback :)

[jasonrhansen]

I would still like to add a test that checks the SVG output since we're currently only testing the parsing.

[jonhoo]

No idea why CI was sad. I've merged now and then I guess we should watch https://travis-ci.org/jonhoo/inferno/builds/491312148.

[jonhoo]

Oh, and thanks! :D