Fixed small caption bug after last release

Fixed andreknieriem#258 with opacity flicker on overlay. For this, mo…

…ved style option captionOpacity to js plugin

Fixed andreknieriem#255 fast switching photos and andreknieriem#256 f…

…or hiding back and next buttons on loop: false

fixed

mousescroll-feature

Updated version number

Updated package.json

Fixed andreknieriem#232 - sourceAttr does not work. Thanks to @bivisual…

… for the issue

changed demo files to right version

Fixed andreknieriem#228 - no mouse swiping in firefox. Thanks to @DrMint

 for the fix