Extract plugins service from MainCtrl
Refactor search to use plugins service
Start with arethusaMocks.plugins
Update specs after extraction of plugins service
Merge pull request #303 from latin-language-toolkit/extract_plugins_service

Extract plugins service
Add arethusaUtil.getProperty()
Add arethusaUtil.setProperty()
Add arethusaUtil.copySelection()
Merge pull request #304 from latin-language-toolkit/aU_update

arethusaUtil update