Mention of the exclusion of developer files in composer package in ve…

…rsion history.

Updating Readme and copyright for 1.9.1.

Bumping version to 1.9.0.

Preparing 1.8.0 release.

Bumped version number to 1.7.0.

Reversionned 1.5.1 as 1.6.0 to respect the versioning policy.

Bumped version to 1.5.1.

Set version number to 1.5.0 (as it should have been), updated URLs to…

… website.

Added donation section in Readme.

Fixed reference to how to do things without autoloading to point to t…

…he new section.