add JSX support for "Nerv"

[g-plane]

Ref: https://github.com/NervJS/nerv

[codecov-io]

Codecov Report

Merging #821 into master will decrease coverage by 4.27%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #821      +/-   ##
==========================================
- Coverage   93.41%   89.14%   -4.28%     
==========================================
  Files          68       68              
  Lines        3753     2800     -953     
==========================================
- Hits         3506     2496    -1010     
- Misses        247      304      +57

Impacted Files	Coverage Δ
src/transforms/babel.js	96.17% <100%> (-2.47%)	⬇️
src/HMRServer.js	52.63% <0%> (-37.85%)	⬇️
src/Asset.js	66.94% <0%> (-31.36%)	⬇️
src/utils/installPackage.js	77.41% <0%> (-19.46%)	⬇️
src/utils/config.js	76.92% <0%> (-17.45%)	⬇️
src/Logger.js	81.9% <0%> (-12.39%)	⬇️
src/Bundle.js	89.79% <0%> (-9.21%)	⬇️
src/assets/GlobAsset.js	90% <0%> (-8.75%)	⬇️
src/visitors/matches-pattern.js	92% <0%> (-8%)	⬇️
src/Server.js	84.37% <0%> (-7.3%)	⬇️
... and 46 more

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[brandon93s]

Integration files have been added, but I don't see any test(s) using them.

[g-plane]

Sorry for missing it. I will add it later.