add feature: removeformat
add environment variable for development mode.
improve converting filter (from html to text)
do not use 'body.scrollTop' attribute in IE11.
add EMPTY_BOGUS
make code a bit more defensive (for IE11)
undo/redo bug fixed : FTDUEDTR-1389
code gardening
converting filter bug fixed : FTDUEDTR-1387
bug: ie11 fontstyle error
Merge branch 'RB-7.4.0' into bug-ie11fontstyle
history module bug fixed for webkit.
canvas set focus on mouseup event. (only IE)
bug: ie11 fontstyle error
improve: test module init
use karma to help us test always.
Merge branch 'RB-7.4.0' into testmodule
add testem (ci tool)
update qunit 1.14
improve test code - webfont & fontfamily
improve test code - WebfontLoader
qunit 1.14 update patch
delete Qunit.diff
QUnit.stop(millisecond) -> QUnit.stop();

karma conf only Chrome.
Merge branch 'testmodule' of https://github.com/daumcorp/DaumEditor into testmodule

Conflicts:
	test/testcase/webfontloader_test.js