Fixes Issue #941 Any theme in chain can contain targets file, and
site root can contain sass\less directory with uncompiled files
and targets file
Merge branch 'master' of https://github.com/getnikola/nikola

Conflicts:
	CHANGES.txt
Merge branch 'master' of https://github.com/getnikola/nikola
Merge remote-tracking branch 'upstream/master'

Conflicts:
	CHANGES.txt
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:ermeaney/nikola
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master' into issue_941
Merge pull request #944 from ermeaney/issue_941

Fixes Issue #941 Any theme in chain can contain targets file, and