Update top-left information when clicking with the eye-dropper tool

[Nnubes256]

Fixes #159. Additionally, I fixed the formatting of the only changed function in order to keep consistency.

[katjaq]

Amaaaazing!! 😃 \ö// Thank you very much for your contributions! The eyedropper tool works very nicely when I click a region that is actually painted. But if I click outside of the mask, I get an error form atlasMaker-interaction.js:685

Uncaught TypeError: Cannot read property 'name' of undefined
    at Object.down (atlasMaker-interaction.js:685)
    at HTMLCanvasElement.mousedown (atlasMaker-interaction.js:466)

Could you add a test if the mouse click hits a region of the mask, then display the info, if not return? That would be fantastic! 🙂 I tested like this:

• I downloaded a mask from here http://brainbox.pasteur.fr/mri?url=https://s3.amazonaws.com/fcp-indi/data/Projects/ABIDE_Initiative/Outputs/freesurfer/5.1/CMU_a_0050656/mri/T1.mgz with the download button in the tool bar,
• and in my local brainbox
  http://localhost:3000/mri?url=https://s3.amazonaws.com/fcp-indi/data/Projects/ABIDE_Initiative/Outputs/freesurfer/5.1/CMU_a_0050656/mri/T1.mgz
• I created a new volume annotation layer (by clicking the plus below the annotation table),
• set the labelset to freesurfer: 48 (in the dropdown) and
• uploaded the aseg.nii.gz mask to this brain with the upload button.

Looking forward to merging your pull request!! Thank you very much again for your work!! 😃

[katjaq]

@Nnubes256 : I merged your pr to avoid future merge conflicts and it displays the name and does not break the app\ö/ so, many thanks for your work again! But I would deeply appreciate if you open a new one with the fix for the error described in my previous comment. mille merci! 😃

[Nnubes256]

Sure thing!