Log Message:
(textproc/R-yaml) Updated 2.2.1 to 2.3.7

### Release Notes

v2.3.7 clang deprecated sprintf. Changed in included clib to snprintf

v2.3.6 C deprecated functions with no prototypes, these were added.

v2.3.5 Patch to put back in libyaml modifications that as.yaml relied on.

v2.3.4
  - Added read_yaml parameter readLines.warn that defaults to TRUE for
    overrriding warnings about incomplete files.

v2.3.3
  -Fixed Bug #99, support for BUILTINSXP functions as handlers

v2.3.2
  - Removed some code that got revert in the libyaml 0.2.5 merge at
    2.2.4 release

v2.3.1
  - Added omap support for output using proper tag.

v2.3.0
  - Made eval.expr default to FALSE

v2.2.4
  - Updated libyaml code from 0.2.5

v2.2.3
  - Added attribute quote support for strings #72 #109

v2.2.2
  - change maintainer from Jeremy Stephens to Shawn Garbett
  - move Git repository to https://github.com/vubiostat/r-yaml