Update README.markdown

Create PULL_REQUEST_TEMPLATE.md

move original project notes aside

Android --> iOS

explicit note that this driver cannot be used w unlimited MAU plan

Merge pull request #667 from mapbox/productquest

update URLs for repo-only podspec

update URLs for legacy vs GL-based

refs #665: remove old GL section

refs #665: docs updates for deprecation

Merge pull request #649 from mapbox/develop

Merge pull request #646 from mapbox/gl-readme-updates

Strengthen GL language, add Swift Offline example

update private header matches

Merge branch 'develop' into release