git extractor: getPreviousRelatedCommits
git-extractor: calculators
git extractor: upd calculatePreviousFiles
git-extractor: rename calculators, PreviousRelatedCommitsCalculator
git-extractor: remove get files diffs
git-extractor: diff -> string in prevRelatedCommits
git-extractor: upd exception and graph tests
git-extractor: firstly print root in json
git-extractor: upd main, print prev related commits
git-extractor: bfs in prevRelatedCommits
git-extractor: bfs in history graph
git-extractor: filter parents from related commits
git-extractor: fix bug in previous related commits
git-extractor: used checking in history graph, update main -> new json format, loading markup, refactoring
Merge branch 'git-extractor'