win: Don't overwrite Chrome hight DPI setting.

Also disable high DPI mode by default, Chrome enables it since
https://codereview.chromium.org/294293002
Make dialog API's parameters more flexible.
Merge pull request #612 from nuivall/master

win: Don't overwrite Chrome high DPI setting.
Bump v0.16.0.
Fixing dialog api parameter parsing
Merge pull request #636 from kitematic/master

Fixing dialog api parameter parsing
docs: Now atom-shell's version should be used when building modules.
BrowserWindow.show() should not focus window, fixes #609.
Bump v0.16.1.
Add switches of web runtime flags.
Pass web runtime features by command line.
docs: Add options for web runtime features.
Make code more tidy.
Use PersistentDictionary to store web perferences.
Merge pull request #641 from atom/web-runtime-flags

Add options for web runtime features
mac: Don't activate window when showing.
views: Set devtools window's icon, fixes #429.
Upgrade brightray.
Make default_app focus the main window on startup.
mac: Add Tray.setTitle API, fixes #560.