Icon pack merge

[k4r7u]

Is there any intention of merging elementaryPlus with elementary-add? elementary-add has a lot of icons matching the original elementary icons.

The purpose of both icon packs seems to be similar/the same. I have currently both icon packs in use by changing the index.html file of elementaryPlus to: Inherits=elementary,elementary-add

This results in better icons for for example Chromium and Seahorse/Keyring/Passwords and Keys while keeping the indicator icons from elementaryPlus:

[k4r7u]

Seems to be a duplicate/addition to #413

[brainscript]

@k4r7u The original and the plus icons have shadows. In the elementary-add icon theme, the icons do not have shadows.