Remove conceal stuff, improve RSpec highlighting, and add RSpec "focus-folding"

editors/vim/after/syntax/ruby.vim

@@ -0,0 +1,11 @@
+" RSpec
+
+  " Syntax highlighting
+    if expand('%') =~# '_spec\.rb$'
+      syn keyword rubyRspec describe context it specify it_should_behave_like before after setup subject let shared_context shared_examples_for
+    endif
+
+    hi def link rubyRspec Function
+
+  " Focus folding on spec"
+    nmap <silent> <Leader>rf mr:set foldmethod=syntax<CR>zMzv?\v^\s*(it\|example)<CR>zz:noh<CR>`r:delmarks r<CR>