Updated docs, tagged 1.5.1

Set version string = 1.5.0

Tagging 1.4.0

Incorrect default-directory in project-ack, project-grep

Tagged version 1.3

Tagging 1.2.1

Close dired buffers on project unload

Thanks to aleblanc@cotse.net for the bug
report and and a fix.

Small doc improvements

tagging version 1.1

version 1.0.3