Remove temporary files (#2)
Ignore relative search paths

Relative search paths may result in duplicated updates if current
working directory resolves to absolute search paths:

ok	/home/rjeczalik/bin/godoc
(code.google.com/p/go.tools/cmd/godoc)
ok	bin/godoc	(code.google.com/p/go.tools/cmd/godoc)
ok	/home/rjeczalik/bin/ciexec
(github.com/rjeczalik/ciexec/cmd/ciexec)
ok	bin/ciexec	(github.com/rjeczalik/ciexec/cmd/ciexec)
ok	/home/rjeczalik/bin/gotree
(github.com/rjeczalik/tools/cmd/gotree)
ok	bin/gotree	(github.com/rjeczalik/tools/cmd/gotree)
Skip updating self (#1)
Display build times
Improve inline documentation
Removed not used verbose mode