Fixed the populateHistory in GitCommitTools. This closes #108.
Revert "Fixed the populateHistory in GitCommitTools. This closes #108."

This reverts commit a768e435ade5bc51bdc54d4899e9a6989122a5f8.
Revert "Revert "Fixed the populateHistory in GitCommitTools. This closes #108.""

This reverts commit 89a256b46b5ab93d0d091db6797ef73e6eb32430.
Fixing null pointer when first commit was added to the collapsed group of nodes
Fixed translation of graph when collapsing / expanding nodes by type. This fixes #110.
The tooltip now shows the branch names of all branches that point to a commit. In this case, the commit is also printed with a heavier stroke. This closes #105.
Including method to retrieve all tags in the repository. This relates to #106.