Merge lp://staging/~ted/ubuntu-app-launch/adding-local-to-data into lp://staging/ubuntu-app-launch/16.04

Unmerged revisions

218. By Ted Gould on 2016-04-21

Add local to default XDG_DATA_DIRS

217. By CI Train Bot Account on 2016-04-21

Releasing 0.9+16.04.20160421.1-0ubuntu1

216. By Ted Gould on 2016-04-21

Fix cut-and-paste error in function comment

215. By Ted Gould on 2016-04-21

Add dependency on libpam-cgfs on Xenial so that cgroups work properly in Upstart Fixes: #1535058
Approved by: Charles Kerr

214. By CI Train Bot Account on 2016-04-21

Ensure all pending events on the context are complete before unref'ing it. Fixes: #1495871
Approved by: PS Jenkins bot

213. By Ted Gould on 2016-04-21

Add a C++ API for UAL
Approved by: Thomas Voß, PS Jenkins bot

212. By Ted Gould on 2016-04-21

Adding support for Read the Docs
Approved by: PS Jenkins bot

211. By Ted Gould on 2016-04-21

If no XDG_DATA_DIRS is set ensure that /usr/share is in the list. Fixes: #1541037
Approved by: PS Jenkins bot

210. By Dimitri John Ledkov on 2016-04-21

Raise to -std=gnu99, because we really want gnu standards, and thus e.g. access CLOCK_MONOTONIC in lttng on arm64/armhf. Resolves FTBFS.
Approved by: Ted Gould, PS Jenkins bot

209. By Michael Terry on 2016-04-21

Fix build by correcting typo in function name.

Without this change, you see the following error:

/usr/include/glib-2.0/glib/gmessages.h:373:3: error: ‘return’ with no value, in function returning non-void [-Werror]
   return; \
   ^
/home/mike/Work/code/ubuntu-app-launch/warn-on-xapp/libubuntu-app-launch/ubuntu-app-launch.c:2406:2: note: in expansion of macro ‘g_return_if_fail’
  g_return_if_fail(job_name != NULL);
  ^
Approved by: Ted Gould, PS Jenkins bot