[emacs] Add snippets for latex mode.

.emacs.d/snippets/latex-mode/begin.yasnippet

@@ -0,0 +1,10 @@
+# -*- mode: snippet -*-
+# contributor: Mads D. Kristensen <madsdk@gmail.com>
+# contributor : Bjorn Reese <breese@users.sourceforge.net>
+# key: begin
+# group: environments
+# name: \begin{environment} ... \end{environment}
+# --
+\begin{${1:$$(yas/choose-value (mapcar 'car (LaTeX-environment-list)))}}
+$0
+\end{$1}