Merge some recipe PRs

remote-tracking branches 'upstream/pr/2132', 'upstream/pr/2133' and 'upstream/pr/2136'

recipes/org-ioslide.rcp

@@ -0,0 +1,6 @@
+(:name org-ioslide
+       :description "Export org-mode to Google I/O HTML5 slide."
+       :type github
+       :pkgname "coldnew/org-ioslide"
+       :depends org-mode
+       :features ox-ioslide)

recipes/org-ref.rcp

@@ -0,0 +1,6 @@
+(:name org-ref
+       :website "https://github.com/jkitchin/org-ref"
+       :description "org-mode modules for citations, cross-references, bibliographies in org-mode and useful bibtex tools to go with it."
+       :type github
+       :pkgname "jkitchin/org-ref"
+       :depends (dash helm helm-bibtex hydra key-chord))

recipes/stacktest.rcp

@@ -0,0 +1,5 @@
+(:name stacktest
+       :website "https://github.com/sdague/stacktest"
+       :description "OpenStack Inline testing mode"
+       :type github
+       :pkgname "sdague/stacktest")