[CONFIGURATION-564] Properties without a value and separator are now supported.

The regular expression was slightly modified to support property
declarations that do not have a separator. Such keys are now added to the
configuration without a value.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1641943 13f79535-47bb-0310-9956-ffa450edef68
[CONFIGURATION-562] Updated changes.xml.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1641944 13f79535-47bb-0310-9956-ffa450edef68