implemented limit for recursive includes

[thovid]

• recursive includes are limited to a depth controlled via configuration
• include-stack is collected during request processing and used for improved log messages
• documentation in readme reflects new feature

Resolves #10

[codecov[bot]]

Codecov Report

Merging #12 into master will increase coverage by 0.86%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #12      +/-   ##
============================================
+ Coverage     80.83%   81.69%   +0.86%     
- Complexity      270      285      +15     
============================================
  Files            34       36       +2     
  Lines           720      754      +34     
  Branches         35       36       +1     
============================================
+ Hits            582      616      +34     
  Misses          114      114              
  Partials         24       24

Impacted Files	Coverage Δ	Complexity Δ
...om/rewedigital/composer/composing/Composition.java	97.05% <ø> (ø)	11 <0> (ø)	:arrow_down:
...l/composer/configuration/DefaultConfiguration.java	93.75% <100%> (+0.41%)	4 <0> (ø)	:arrow_down:
...ewedigital/composer/composing/CompositionStep.java	100% <100%> (ø)	7 <7> (?)
.../composer/composing/ComposerHtmlConfiguration.java	100% <100%> (ø)	7 <4> (+2)	:arrow_up:
...ewedigital/composer/composing/IncludedService.java	100% <100%> (ø)	11 <3> (+2)	:arrow_up:
...al/composer/composing/AttoParserBasedComposer.java	100% <100%> (ø)	9 <0> (ø)	:arrow_down:
...gital/composer/composing/IncludeMarkupHandler.java	70.88% <100%> (ø)	21 <0> (ø)	:arrow_down:
...l/composer/composing/ValidatingContentFetcher.java	95% <100%> (ø)	9 <0> (ø)	:arrow_down:
...om/rewedigital/composer/routing/TemplateRoute.java	95.45% <100%> (+0.21%)	11 <1> (ø)	:arrow_down:
...wedigital/composer/composing/IncludeProcessor.java	100% <100%> (ø)	8 <3> (ø)	:arrow_down:
... and 3 more

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[AndreasKl]

Squashed and merged.