Add a configuration to enable caching

[villfa]

New configuration: cachePath

Closes #187

[codecov]

Codecov Report

Merging #303 (4da142d) into master (1f80757) will increase coverage by 0.51%.
The diff coverage is 97.10%.

@@             Coverage Diff              @@
##             master     #303      +/-   ##
============================================
+ Coverage     97.68%   98.20%   +0.51%     
- Complexity        1        2       +1     
============================================
  Files            31       36       +5     
  Lines           562      667     +105     
============================================
+ Hits            549      655     +106     
+ Misses           13       12       -1     

Impacted Files	Coverage Δ	Complexity Δ
src/Process/ChurnProcess.php	92.85% <ø> (ø)	0.00 <0.00> (ø)
src/File/FileHelper.php	92.85% <92.30%> (-7.15%)	0.00 <0.00> (ø)
src/Process/ConcreteProcessFactory.php	95.45% <95.45%> (ø)	0.00 <0.00> (?)
src/Process/CacheProcessFactory.php	95.74% <95.74%> (ø)	0.00 <0.00> (?)
src/Process/Observer/OnSuccessBuilder.php	96.15% <96.15%> (ø)	0.00 <0.00> (?)
src/Command/RunCommand.php	100.00% <100.00%> (+5.63%)	0.00 <0.00> (ø)
src/Configuration/Config.php	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
src/Configuration/Validator.php	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
src/Process/Handler/BaseProcessHandler.php	100.00% <100.00%> (ø)	0.00 <0.00> (?)
src/Process/Handler/ParallelProcessHandler.php	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
... and 12 more

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