[wip] gtk 2.0 -> 3.0
[wip] add button function
[wip] add button function
add frame, swap frame, delete frame
rapngasm require_relative -> require
[wip] add assemble & disassenble
add assemble function     [wip] disassemble
[wip] disassemble function
[wip] animation play
add animation(preview) function
add function     export each frame
[wip] file export bug...
[wip] import apng file
[wip] import apng file
[wip] menu bar
add menu bar   [wip] import apngframe
import apngframe
import apng file
Merge pull request #2 from apngasm/connect_rapngasm

Connect rapngasm