<i18n dev> Review request : 7180362: RFE: Implement date cutover functionality for currency.properties file

[Seán Coffey]

7180362 deals with an enhancement to allow the JRE specify cutover dates 
when currency.properties file is provided. I've added the required 
syntax to the new javadoc comments in Currency class.

bug report :http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7180362
webrev : http://cr.openjdk.java.net/~coffeys/webrev.7180362.1.jdk8/ 
<http://cr.openjdk.java.net/%7Ecoffeys/webrev.7180362.1.jdk8/>

I hope to port an almost identical change to 7u shortly. (minus API 
javadoc comments)

I've kept the testcase logic different to the JRE logic around how the 
new property is parsed to better
test the golden result expectations. (both approaches should be equal)

Regards,
Sean.