Embrace Org's recommendation of lowercase blocks

(and keywords) see https://code.orgmode.org/bzg/org-mode/commit/13424336a6f30c50952d291e7a82906c1210daf0

org-mode/begin_center

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_CENTER block
+# name: #+begin_center block
 # key: <C
 # uuid: <C
 # --
-#+BEGIN_CENTER
+#+begin_center
 `%`$0
-#+END_CENTER
+#+end_center

org-mode/begin_comment

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_COMMENT block
+# name: #+begin_comment block
 # key: <c
 # uuid: <c
 # --
-#+BEGIN_COMMENT
+#+begin_comment
 `%`$0
-#+END_COMMENT
+#+end_comment

org-mode/begin_example

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_EXAMPLE block
+# name: #+begin_example block
 # key: <e
 # uuid: <e
 # --
-#+BEGIN_EXAMPLE
+#+begin_example
 `%`$0
-#+END_EXAMPLE
+#+end_example

org-mode/begin_export

@@ -1,5 +1,5 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_EXPORT ... block
+# name: #+begin_export ... block
 # key: <E
 # type: command
 # --

org-mode/begin_export_ascii

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_EXPORT ascii
+# name: #+begin_export ascii
 # key: <a
 # uuid: <a
 # --
-#+BEGIN_EXPORT ascii
+#+begin_export ascii
 `%`$0
-#+END_EXPORT
+#+end_export

org-mode/begin_export_html

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_EXPORT html block
+# name: #+begin_export html block
 # key: <h
 # uuid: <h
 # --
-#+BEGIN_EXPORT html
+#+begin_export html
 `%`$0
-#+END_EXPORT
+#+end_export

org-mode/begin_export_latex

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_EXPORT latex block
+# name: #+begin_export latex block
 # key: <l
 # uuid: <l
 # --
-#+BEGIN_EXPORT latex
+#+begin_export latex
 `%`$0
-#+END_EXPORT
+#+end_export

org-mode/begin_quote

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_QUOTE block
+# name: #+begin_quote block
 # key: <q
 # uuid: <q
 # --
-#+BEGIN_QUOTE
+#+begin_quote
 `%`$0
-#+END_QUOTE
+#+end_quote

org-mode/begin_src

@@ -1,5 +1,5 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_SRC ... block
+# name: #+begin_src ... block
 # key: <s
 # type: command
 # --

org-mode/begin_verse

@@ -1,5 +1,5 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_VERSE block
+# name: #+begin_verse block
 # key: <v
 # type: command
 # --

org-mode/blog

@@ -3,9 +3,9 @@
 # key: blog
 # uuid: blog
 # --
-#+STARTUP: showall indent
-#+STARTUP: hidestars
-#+BEGIN_HTML
+#+startup: showall indent
+#+startup: hidestars
+#+begin_html
 ---
 layout: default
 title: ${1:title}

org-mode/export

@@ -3,6 +3,6 @@
 # key: export
 # uuid: export
 # --
-#+BEGIN_EXPORT ${1:type}
+#+begin_export ${1:type}
 `%`$0
-#+END_EXPORT
+#+end_export

org-mode/figure

@@ -3,6 +3,6 @@
 # key: fig
 # uuid: fig
 # --
-#+CAPTION: ${1:caption}
-#+ATTR_LaTeX: ${2:scale=0.75}
-#+LABEL: fig:${3:label}
+#+caption: ${1:caption}
+#+attr_latex: ${2:scale=0.75}
+#+label: fig:${3:label}

org-mode/head

@@ -3,6 +3,6 @@
 # key: head
 # uuid: head
 # --
-#+TITLE:     ${1:Untitled Document}
-#+AUTHOR:    ${2:`user-full-name`}
-#+EMAIL:     ${3:`user-mail-address`}
+#+title:     ${1:untitled document}
+#+author:    ${2:`user-full-name`}
+#+email:     ${3:`user-mail-address`}

org-mode/jupyter

@@ -1,9 +1,9 @@
 # -*- mode: snippet -*-
-# contributor: Seong Yong-ju
-# name: #+BEGIN_SRC jupyter-...
+# contributor: seong yong-ju
+# name: #+begin_src jupyter-...
 # uuid: jupyter
 # key: jupyter
 # --
-#+BEGIN_SRC jupyter-${1:$$(yas-choose-value '("python" "julia" "R"))}${2: :session $3}${4: :async yes}
+#+begin_src jupyter-${1:$$(yas-choose-value '("python" "julia" "r"))}${2: :session $3}${4: :async yes}
 `%`$0
-#+END_SRC
+#+end_src

org-mode/latex

@@ -3,6 +3,6 @@
 # key: latex
 # uuid: latex
 # --
-#+BEGIN_LaTeX
+#+begin_latex
 `%`$0
-#+END_LaTeX
+#+end_latex

org-mode/src

@@ -1,8 +1,8 @@
 # -*- mode: snippet -*-
-# name: #+BEGIN_SRC
+# name: #+begin_src
 # uuid: src
 # key: src
 # --
-#+BEGIN_SRC $1
+#+begin_src $1
 `%`$0
-#+END_SRC
+#+end_src

org-mode/width

@@ -1,4 +1,4 @@
 # -*- mode: snippet -*-
-# name: #+ATTR_HTML: :width ...
+# name: #+attr_html: :width ...
 # --
-#+ATTR_HTML: :width ${1:500px}
+#+attr_html: :width ${1:500px}