roo-rb / roo / 522

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travis-ci

Introduce GC'able cache for Roo::Excelx::Extractor#doc (#456)

Memory Profiling script:
```
MemoryProfiler.report{Roo::Excelx.new('test/files/Bibelbund.xlsx').tap{|x|(2..x.last_row).each{|i| x.row(i)}}}.pretty_print

```

Benchmark Script:
```
puts Benchmark.measure{ Roo::Excelx.new('test/files/Bibelbund.xlsx').tap{|x|(2..x.last_row).each{|i| x.row(i)}} }
```


Result on Master:
```
Total allocated: 37131810 bytes (517026 objects)
Total retained:  5562913 bytes (103010 objects)

allocated memory by gem
-----------------------------------
  19288066  roo/lib
  11049821  nokogiri-1.8.4
   6792403  rubyzip-1.2.2
      1304  tmpdir
       216  other

retained memory by gem
-----------------------------------
   5560934  roo/lib
       782  rubyzip-1.2.2
       725  nokogiri-1.8.4
       296  tmpdir
       176  other

  0.720000   0.020000   0.740000 (  0.733750)
```

Result after patch:
```
Total allocated: 34561842 bytes (504998 objects)
Total retained:  5563553 bytes (103026 objects)

allocated memory by gem
-----------------------------------
  19254338  roo/lib
   8513101  nokogiri-1.8.4
   6792403  rubyzip-1.2.2
      1304  tmpdir
       320  weakref
       216  other
       160  ref-2.0.0

retained memory by gem
-----------------------------------
   5561094  roo/lib
       782  rubyzip-1.2.2
       725  nokogiri-1.8.4
       320  weakref
       296  tmpdir
       176  other
       160  ref-2.0.0

  0.610000   0.010000   0.620000 (  0.618642)
```

32 of 32 new or added lines in 4 files covered. (100.0%)

1706 of 1820 relevant lines covered (93.74%)

233070.82 hits per line