feat(resources): add alva icons

resources/icon.icns

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+How to use this icon:
+
+Step 1: Copy the icon to the clipboard
+a) Click on this file from the Finder
+b) Choose 'Get Info' from the 'File' menu.
+c) In the info window that pops up, click on the icon
+d) Choose 'Copy' from the 'Edit' menu.
+e) Close the info window
+
+Step 2: Paste the icon to the desired item
+a) Go to the item in the Finder that you want a custom icon
+b) Click the item (file, folder, disk, etc) 
+b) Choose 'Get Info' from the 'File' menu.
+c) In the info window that pops up, click on the icon
+d) Choose 'Paste' from the 'Edit' menu.
+e) Close the info window
+
+Step 3: 
+Enjoy your newly customized icon!
+
+For more thorough directions, see Apple's website at:
+http://www.apple.com/support/mac101/customize/6/