Add the 2009 and 2012 syntax for flexbox
Merge branch 'develop' into fix/flexbox-IE

Conflicts:
	views/css/tao-3.css
	views/css/tao-3.css.map
	views/css/tao-main-style.css.map
Merge branch 'fix/flexbox-IE' into develop
the main-size property of flex-box is not supported under IE
Merge branch 'fix/flexbox-IE' of git://github.com/oat-sa/tao-core into fix/flexbox-IE

Conflicts:
	views/css/tao-3.css.map
Merge branch 'fix/flexbox-IE' into develop