small internal improvements
improve plugin load time

see https://developer.atlassian.com/display/DOCS/How+to+Speed+Up+Plugin+Startup
upgrade Jerry
script to disable velocity caching
fix multiple occurrences of elements in CSV export

if multi vote is included multiple times in a page, it should not be displayed
multiple times in the CSV export dialog
upgrade hamcrest
make standard header names configurable

fixes MV-14