NGaffney and syl20bnr Remove ess-R-object-popup from ess layer.
As described in issue #9464, this package was removed from melpa for
not having a GPL compatible license and is causing an error every time
spacemacs starts.

Continuation of commit 8c3cf7c
Latest commit 51de051 Oct 4, 2017
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+chat Remove trailing whitespace from all files Apr 2, 2017
+checkers syntax-checking: Mention that flycheck is disabled in emacs-lisp-mode. Apr 2, 2017
+completion helm-bookmarks: don't change keys to early Nov 2, 2017
+distributions Import help-fns+.el as local package Jan 25, 2018
+emacs use org-mime provided by melpa Jan 23, 2018
+email Bump year in copyright headers Apr 2, 2017
+frameworks Remove deferred for projectile-rails Apr 2, 2017
+fun configure xkcd inside the :init progn clause Apr 2, 2017
+intl Chinese layer: update package name due to upstream renaming Jan 23, 2018
+lang Remove ess-R-object-popup from ess layer. Jan 25, 2018
+misc/nlinum fix error when nlinum is enabled and dotspacemacs-line-numbers is t Apr 2, 2017
+os Bump year in copyright headers Apr 2, 2017
+pair-programming/floobits Bump year in copyright headers Apr 2, 2017
+source-control Add transient state for smerge mode Apr 2, 2017
+spacemacs Import info+.el as local package Jan 25, 2018
+tags Fixed keybinding to helm-cscope-find-calling-this-function Jan 23, 2018
+themes Backport up to date lists of themes Jan 23, 2018
+tools Remove trailing whitespace from all files Apr 2, 2017
+vim Remove trailing whitespace from all files Apr 2, 2017
+web-services Use helm-spotify-plus instead of helm-spotify Jan 23, 2018
LAYERS.org Update LAYERS.org Oct 3, 2016
auto-layer.el core: add support for interpreter-mode-alist to layer lazy installation Apr 2, 2017