Merge branch '2.7' into 2.8

* 2.7:
  [travis] fix php-ext/ location

.travis.yml

@@ -108,7 +108,7 @@ before_install:
           local ext_name=$1
           local ext_so=$2
           local ext_dir=$(php -r "echo ini_get('extension_dir');")
-          local ext_cache=~/php-ext/$(basename $ext_dir)/$ext_name
+          local ext_cache=php-ext/$(basename $ext_dir)/$ext_name
 
           if [[ -e $ext_cache/$ext_so ]]; then
               echo extension = $ext_cache/$ext_so >> $INI