Issue #296: updated to version 1.5.7

Issue #289: updated version to 1.5.6

Issue #287: updated version to 1.5.5

Issue #275: updated version to 1.5.4 (#276)

Issue #260: updated version to 1.5.3 (#264)

Issue #235: updated version to 1.5.2 (#256)

Issue #219: updated version to 1.5.1 (#228)

Issue #152: updated version to 1.5.0 (#216)

Issue #197: updated version to 1.4.2

Issue #196: prepare and release version 1.4.1