Prepare version 1.5.7 (FredrikNoren#1349)

Merge pull request FredrikNoren#1308 from campersau/release

Prepare version 1.5.6

Merge pull request FredrikNoren#1291 from campersau/bump

Prepare version 1.5.5

Merge branch 'update_diff2html'

Merge pull request FredrikNoren#1271 from campersau/gitparser

fix gitparser for merge / empty commits

Merge pull request FredrikNoren#1268 from campersau/prepare_152

Prepare version 1.5.2

Merge pull request FredrikNoren#1247 from campersau/release-1.5.0

Prepare Release 1.5.0

Merge pull request FredrikNoren#1221 from ParkSB/fix-header-logo-width

Fix the width value of the header logo

Merge pull request FredrikNoren#1215 from simonwiles/prevent_diff_lin…

…enumber_selection

Prevent diff linenumber selection