51 expanding one dimension

[JohannesHoffmann]

Hi, here is my version on how it should work.
This PR tackles #51
It currently allows only the width dimension.

What have i done:

• found a bug when oversized elements fits into bin but in rotated manner
• add tests to check the bug
• changed PACKING_LOGIC values to be strings instead of numbers to make the logic option more readable
• Added new logic option fillWidth because this feature is mainly related to the findNode method
• added logic in findNodefor fillWidth
• added tests for logic fillWidth
• addes some comments helping me and hopefully others to explain what some code is doing
• updated Readme.md to explain logic option

hope everything is clear and seeing forward for some feedback :)

[JohannesHoffmann]

Here is a visual result for my usecase and i am really happe with it:

(lightblue boxes are rects, darker boxes are freeRects)

[soimy]

The results look great!
But I prefer to let PACKING_LOGIC stick with enum rather than string. The switch of string will break many packages depending on this module, which will be a breaking change.

[JohannesHoffmann]

oh yeah good point. will change it back to enum

[JohannesHoffmann]

Just found out how to make it better druring setup in my project. Changed the code to keep the method updateBinSize() of maxrects-bin.ts untouched. Noticed that this.verticalExpand set to always false for the fill width method leads to the same result AND it stores the actual used width instead of always the maxWidth. I like this more then my previous approach. Both width and height are now working the same and the same as with other logics when smart is set to true.

[coveralls]

Coverage: 91.299% (+0.4%) from 90.862% when pulling e88abfa on JohannesHoffmann:51-expanding-one-dimension into 11fd72c on soimy:master.