Imporve performance of body readers

[vkostyukov]

There is still a room for improvements, but this is a good step forward: 30% less allocations and 20% better performance (running time) for string-based readers.

Before:

[info] BodyBenchmark.byteArray                           avgt   20   614.957 ±   9.786   ns/op
[info] BodyBenchmark.byteArray:·gc.alloc.rate.norm       avgt   20  3408.000 ±   0.001    B/op
[info] BodyBenchmark.byteArrayOption                     avgt   20   516.548 ±  83.328   ns/op
[info] BodyBenchmark.byteArrayOption:·gc.alloc.rate.norm avgt   20  3232.000 ±   0.001    B/op
[info] BodyBenchmark.string                              avgt   20  2933.702 ± 136.387   ns/op
[info] BodyBenchmark.string:·gc.alloc.rate.norm          avgt   20  9836.002 ±  10.691    B/op
[info] BodyBenchmark.stringOption                        avgt   20  2601.393 ±  52.171   ns/op
[info] BodyBenchmark.stringOption:·gc.alloc.rate.norm    avgt   20  9620.001 ±  10.691    B/op

After:

[info] BodyBenchmark.byteArray                           avgt   20   622.243 ±  18.590   ns/op
[info] BodyBenchmark.byteArray:·gc.alloc.rate.norm       avgt   20  3392.000 ±   0.001    B/op
[info] BodyBenchmark.byteArrayOption                     avgt   20   429.114 ±  10.309   ns/op
[info] BodyBenchmark.byteArrayOption:·gc.alloc.rate.norm avgt   20  3200.000 ±   0.001    B/op
[info] BodyBenchmark.string                              avgt   20  2498.887 ± 176.078   ns/op
[info] BodyBenchmark.string:·gc.alloc.rate.norm          avgt   20  7064.001 ±   0.003    B/op
[info] BodyBenchmark.stringOption                        avgt   20  2271.496 ± 120.459   ns/op
[info] BodyBenchmark.stringOption:·gc.alloc.rate.norm    avgt   20  6888.001 ±   0.003    B/op

[codecov-io]

Current coverage is 84.02%

Merging #474 into master will decrease coverage by -1.11% as of b4c5ec3

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