Support loading Uri Strings

[colinrtwhite]

Is your feature request related to a problem? Please describe.
Currently load(String) must always be a valid URL, but we could support automatically switching between Uris and HttpUrls.

Describe the solution you'd like
This should load the file/asset Uri correctly:

imageView.load("file:///android_asset/starrynight.jpg")

Additional context
Glide and Picasso already handle this.

Previous discussion: #10

[ghost]

Should analyze the string to determine whether it is a file type，Glide has made a judgment.

like:

if (str.startsWith("http"))
load(str, imageLoader, builder)
else
load(File(str), imageLoader, builder)