Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56115
Expose the httpusecaches property of Ant's get task as some users may need to change the default.
Based on a suggestion by Anthony. 

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1566695 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56115
Merged r1566699 from tomcat/trunk:
Followup to r1566695
Correct typo

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1566700 13f79535-47bb-0310-9956-ffa450edef68