tracing-your-own-user-application: lttng view before destroy

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
New section: using-tracepoint-classes
Move enterprise distributions section one level up

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Merge branch 'master' into changes-2014-10-19

Conflicts:
	contents/installing-lttng/desktop-distributions/intro.md

Conflict resolution was done by using intro.md from
    git://github.com/lttng/lttng-docs.git master

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>