LUTECE-1840 : remove duplicated plugin-test.xml
LUTECE-1841 : remove obsolete message reference
LUTECE-1842 : Describe the button's action in the tooltip
LUTECE-1843 : Add a parameter to activate cache statistics

Add a .statistics (true|false) parameter to caches.properties.
Default is false to not change the out of the box behavior.
When set to true, statistics can be monitored via JMX.
Merge pull request #7 from rzara/LUTECE-1840

LUTECE-1840 : remove duplicated plugin-test.xml
Merge pull request #8 from rzara/LUTECE-1841

LUTECE-1841 : remove obsolete message reference
Merge pull request #9 from rzara/LUTECE-1842

LUTECE-1842 : Describe the button's action in the tooltip
Merge pull request #10 from rzara/LUTECE-1843

LUTECE-1843 : Add a parameter to activate cache statistics
LUTECE-1844 : The filter controlling the maximum file size does not display the error message
LUTECE-1844 : The filter controlling the maximum file size does not display the error message