configure: Don't generate Documentation/log/Makefile

Issue #204.
build: Pipe stderr of 'find' to /dev/null

Issue #192.
build/www/lib/Twig: Remove CLEANFILES

This is covered by the CLEANFILES variable in build/Makefile.am.

Issue #192.
Merge branch 'feature/192'
tools/pipbot: Deploy/undeploy should only affect build/

Issue #206.
tools/pipbot: Add '(un)?install' command

This invoke make directly.

Issue #206.
Merge branch 'feature/206'