Able to handle 100MB image

[nus-se-pr-bot]

https://commons.wikimedia.org/wiki/File:0-cynefin-ORIGINEEL.jpg

if you put that 100MB image in, it technically works and render but it becomes so laggish that I cannot type in other commands. And It load the same thing again on start up. Can try to either crop or restrict size

_{[original: nus-cs2103-AY1718S2/pe-round1#925]}

Issue created by: @pukipuki