wq.app 1.0 beta

wq.app 1.0 beta brings a number of new features and bug fixes to wq.app 1.0 alpha 2.

wq/app.js

Added two additional asynchronous plugin hooks. Returning a Promise from either hook will cause further processing to wait until the Promise is resolved.
- [plugin].context(currentContext, routeInfo) is called just before rendering a page template. This makes it possible to perform arbitrary asynchronous data lookups before navigating to a new page (#30). Think Django’s context processors, but on the client and asynchronous.
- [plugin].onsave(outboxItem, serverResponse) is called just after a successful outbox submission (344e776). This makes it possible to perform additional work (e.g. custom model updates) before continuing.
Made all plugin attributes optional, so you can register anonymous plugins - though they won’t be configurable (#59).

Added support for arbitrary route modes beyond the default list, detail, and edit (de578f4). Custom modes have URLs of the form /items/123/custommode and will be rendered with templates named e.g. item_custommode.html. Modes should be specified as part of the page configuration, e.g.:
```
{
    "name": "item",
    "url": "items",
    "list": "true",
  
   // Client+server modes
    "modes": ["list", "detail", "edit", "custommode"],
  
    // Server-only modes
    "server_modes": ["servercustommode"]
}
```
Both client+server and server-only modes can be specified. Client+server modes will be rendered on the client once wq/app.js initializes. Server-only modes are always rendered on the server, but can still take advantage of the plugin infrastructure ([plugin].run()). Since wq/app.js automatically loads URLs it doesn’t recognize from the server, it is not necessary to register server-only modes if they don’t require plugins.
New wq/patterns.js plugin to support the common case of attaching multiple nested records to a single parent form (ee0b6a2).
[parent]_label context variable for foreign keys (2a40fc7).

Added app.nav(url, changePageOptions) and app.refresh() to facilitate common page navigation tasks (ee0b6a2).
Option to render postsave URLs as templates (a2b31d4)

Support multiple maps on the same page (34664cd).
Switch default basemaps from MapQuest to Stamen, one of the few remaining free providers that doesn’t require an API key (#68).
Simplify integration of Esri basemaps via wq/mapserv.js (a2e4249).

Allow specifying the store backing the model as a string name (16a7b42). This makes it possible to configure custom model stores via JSON, and initialize them in JavaScript elsewhere.
Deep-copy items retrieved from indexes to ensure modification doesn’t have unexpected side effects (c4b7c34).

Ensure bar-shadow: false actually disables text shadows in SCSS themes (5bee3ba).
Code style improvements