Add LICENSE and phpunit.xml.dist in package.ini for Pear.

This commit addresses issues #124 and #126. LICENSE will be installed
with the "doc" role while phpunit.xml.dist will be installed with the
"test" role.

[ci skip]

package.ini

@@ -21,7 +21,9 @@ php = ">= 5.3.2"
 pearinstaller = "1.4.1"
 
 [roles]
+*.xml.dist = test
 *.md = doc
+LICENSE = doc
 lib = php
 
 [optional phpiredis]