The master branch now requires Qt 5.2.1 or newer;
however, I think it's prudent to wait for the switch to C++14,
because (from what I've read) some compilers don't fully support C++14 yet.
I'm probably going to release 2.2.0 next month,
after I have completed my work on the command line,
and Equoda has finished his work on copied objects.