new drawable resources
add <merge> and <include> to layout resource
update drawable class descriptioons to point to resources guide
add ID resource type
Change-Id: I733eec50bb2671f28c9e6dd7dec14eb6586f5193
docs: rewrite resources documentation
Huge overhaul. Includes all new dev guides about how resources are used
on Android and how to provide alternatives, including how to handle
runtime configuration changes (restarts). Plus all new reference
docs for all the resource types (drawables, strings, menus, etc.).
Change-Id: I12e819d2c5fc11e062281d8fe442c3037e92000a
Adding a new Localization doc and Hello Localization tutorial, along
with graphics. Updating the left-nav to include these two documents.
Moved images into /images folder. Changed to max linewidth of 80.
