updated eslint rules & coding style
add radius param to ui
new (horizontal+vertical) caluclate blur, use radius
try calc Lightness and restore color of it
calc new rgb acoriding to blur, amount and threshold
fix: add bound pixel instead 0 in sum of neighbor
fix calculation diff for unsharp
move to integer arifmetic
inset const
Merge branch 'master' of https://github.com/nodeca/pica into temp

Conflicts:
	lib/pure/blur.js
	lib/pure/resize.js
	lib/pure/unsharp.js
merge with master