Demonstration of bugs for issues 1525 & 1526

[asbjornu]

Rebase and conflict resolvement of #1533. Resolves #1533, fixes #1525, fixes #1526.

[ruhullahshah]

@asbjornu Maybe this (https://github.com/GitTools/GitVersion/issues/1526#issuecomment-466460003) exploration, if not already known, provides the starting point for fixing the CommitsSinceVersionSource

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. After 30 days from now, it will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. After 30 days from now, it will be closed if no further activity occurs. Thank you for your contributions.