Rename package to revealjs.ids

Renames the fork so the IDS corporate design edition can be installed
alongside upstream rstudio/revealjs (same pattern as posterdown.ids).
Use revealjs.ids::revealjs_presentation in the R Markdown yaml header.

Changes: DESCRIPTION (Package name, Version -> 0.9.1.9009, Title notes
the IDS edition), R/utils.R package lookups, skeleton + RStudio
template identity (now 'Reveal.js Presentation (IDS CD theme)'),
README usage, GitLab CI render call, tests, examples. Old documents
referring to revealjs::revealjs_presentation need upstream revealjs
or a search/replace of the prefix.

Change-Id: Id3988b2c3fd348faca3c0951223d0b90c01741dc
diff --git a/DESCRIPTION b/DESCRIPTION
index 06e0d4a..ac4cfe0 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Type: Package
-Package: revealjs
-Title: R Markdown Format for 'reveal.js' Presentations
-Version: 0.9.1.9008
+Package: revealjs.ids
+Title: R Markdown Format for 'reveal.js' Presentations -- IDS Mannheim Corporate Design Theme Edition
+Version: 0.9.1.9009
 Date: 2017-03-13
 Authors@R: c(
     person("Christophe", "Dervieux", , "cderv@posit.co", role = "cre"),