don't save on first loading a question or exam
fix removal of function parameters

When creating a function on page load, the FunctionParameter constructor was being passed `this` (which happened to be the browser window object) instead of a reference to the function model.
fixes #122
update JME scripts
update JME scripts again
Merge branch 'master' into bootstrap
bootstrap: choices for 1_n_2 parts; input labels are clickable