web: Add a possibility to configure the max. length of commit subject.
git: Add a new method to Repo: get_num_of_unmerged_commits().
git: Add a new method to Branch: num_of_unmerged_commits().
git: Add a new method to Branch: has_more_unmerged_commits_than().
git_tests: Refactor BranchUnmergedCommitsTests.
web: Make the display of unmerged commits more user friendly.
utils: Make nonempty_lines() return a list.
web: Add a favicon.
web: Make the "Ignored branches" section more readable.
web: Update the CSS style.
web: Fix a typo in index.html.
web: Update the CSS style.
web: Add a note after "No unmerged commits".