Multiple changes: ids and plugins

* change measurement ids to JS friendly format
* Update testsuite after changing measurement ids format
* Update doc to reflect measurement id format change
* Add 'scripts' argument to 'startEpiviz' for JS plugins
* Update 'startEpiviz' doc to add 'scripts' argument
* Clean up the 'epivizrMsg' function
* Remove call from non-blocking warning
* Version Bump (1.1.2)