feature #1255 added the round filter (fabpot)

This PR was merged into the master branch.

Discussion
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added the round filter

fixes #1238

Commits
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ff4a7d2 added the round filter

diff --cc CHANGELOG
index 4a9a8fd,5787617..5fd88cd
--- 1/CHANGELOG
--- 2/CHANGELOG
+++ b/CHANGELOG
@@@ -1,8 -1,6 +1,9 @@@
  * 1.15.0 (2013-XX-XX)
  
+  * added the round filter
 + * fixed a bug that prevented the optimizers to be enabled/disabled selectively
 + * fixed first and last filters for UTF-8 strings
 + * added a source function to include the content of a template without rendering it
   * fixed the C extension sandbox behavior when get or set is prepend to method name
  
  * 1.14.2 (2013-10-30)

diff --cc doc/templates.rst
Simple merge

diff --cc lib/Twig/Extension/Core.php
Simple merge