Merge branch 'release/1.0.0' into develop

* release/1.0.0:
  Adding CHANGELOG.md and changing information about version in README.md
Merge branch 'hotfix/1.0.1' into develop

* hotfix/1.0.1:
  Updating CHANGELOG
  Replaced system() with exec() when determining commit information
Rename version_tools to appversion
Merge branch 'release/2.0.0'

* release/2.0.0:
  Rename version_tools to appversion