Image source example

[langsmith]

Adds example using image source. The same example that @asheemmamoowala added to the maps SDK test app.

Has DO NOT MERGE label because as of this writing, the example only works while using a 5.2.0-SNAPSHOT. I'll eventually merge when stable 5.2.0 is released.

[langsmith]

Fixes #437

[xilinggrantli]

How to use the 5.2.0 version? From Jcenter, it seems not to exist.

[langsmith]

Hi @siazeroli , please use the 5.2.0-SNAPSHOT in your Gradle file 👇 if you'd like to view the image source example.

compile('com.mapbox.mapboxsdk:mapbox-android-sdk:5.2.0-SNAPSHOT@aar') {
        transitive = true
    }

Thanks!

[xilinggrantli]

Yes, I tried to add it my gradle, but it told me "Error:(101, 13) Failed to resolve: com.mapbox.mapboxsdk:mapbox-android-sdk:5.2.0-SNAPSHOT". I truly want to use imagesource in my project, but 5.1.3 version does not support this class.

[langsmith]

You're correct, 5.1.3 does not support this class. Please post your complete gradle file so that I can see if there are any errors.

[cammace]

@siazeroli it sounds like you are missing the repository specific to SNAPSHOTs. Please add this line inside your apps build.gradle file.

maven { url "http://oss.sonatype.org/content/repositories/snapshots/" }

[xilinggrantli]

@cammace Yep, I missed it. Problem solved. Thank you!

[osana]

Cannot compile because of duplicate strings in
title_strings.xml and string.xml

[osana]

to avoid a crash on orientation change in tablets we should add:
if (handler != null && runnable != null) {
handler.removeCallbacks(runnable);
}

[langsmith]

Does the trick on the tablet emulator. No crashing. Thanks.

Think we're good to go on this pr