crush: tests for crushtool --build

Signed-off-by: Loic Dachary <loic@dachary.org>
doc: crushtool man page nroff format

also includes a modification from a prior patch series that was not
formatted to nroff.

Signed-off-by: Loic Dachary <loic@dachary.org>
doc: update the crushtool manual page

* add information about CEPH_ARGS
* rework the --build documentation and example
* add an Author section
* replace vi with emacs for no good reason
* cleanup whitespace

Signed-off-by: Loic Dachary <loic@dachary.org>
doc: copyright s/2013/2014/

Signed-off-by: Loic Dachary <loic@dachary.org>
doc: format man pages with s/2013/2014/

Signed-off-by: Loic Dachary <loic@dachary.org>