* Step 1: move electorn into `app/`.
This is to comply with the suggested directory format of
`electron-builder`: https://github.com/electron-userland/electron-builder#two-packagejson-structure
* Step 2: add build directory with icon files for mac / windows
* Step 3: move all development (web) assets into main directory
* Step 4: add `build` namespace to dev `package.json`
* Step 5: move all dev dependencies into dev file and get rid of
old electron packagers in favor of `eletorn-builder`
* Step 6: target build inside `app/` as everything else is excluded at build time
* Step 7: remove old stuff!
* Step 8: update README
* turn off asar for `child_pty`
* Move window close button into shell submenu
IMO actions that affect a session don't belong into the window menu.
* Add window zoom menu item
fixes#234
- Add missing separator after `About`.
- Use `role` instead of deprecated `selector` for menu items
- Add `undo` and `redo` menu items. Both Terminal and iTerm have these.
- Remove indent of the report issue template. The indent ended up in the issue body, which looks weird.
- Add separator after `New Tab`. This is how iTerm does it.
