Minor javadoc fix #75
SeleniumQueryObject#elements is immutable + .get() returns immutable list - see #76
.as() plugin functions don't get SeleniumQueryObject#elements as args anymore - see #76
.get(idx) wont use SeleniumQueryObject#elements anymore - see #76
.html() wont use SeleniumQueryObject#elements anymore - see #76
.parent() wont use SeleniumQueryObject#elements anymore - closes #76