basic world zoom restriction
basic panning restriction
add longitude constraints
fix scale constraints
minor constrain code cleanup
constrain on resize
add map maxBounds option
fix transform test
constrain cleanup and some comments
Merge pull request #646 from mapbox/maxbounds

Map navigation constraints & max bounds
fix example
Merge branch 'dev-pages' of https://github.com/mapbox/llmr into dev-pages
add grab cursors to example maps
Provide HTTP[S]_URL configuration options
update config
fix copy world flickering issue, close #645
update changelog
remove some links from readme
add links to blog posts
update webgl fundamentals link