Add default tile size @define, refs #114, fixes #120
Ensure DOM element is removed when layer is removed
Upgrade to latest version of pake
Only run gjslint on modified files
Remove removeLayer, thanks @fredj
Merge pull request #125 from twpayne/build-clean-ups

Build clean ups
Merge pull request #124 from twpayne/dom-renderer-layer-remove

Ensure DOM element is removed when layer is removed
Merge pull request #121 from twpayne/attribution-control-refactoring

Attribution control refactoring
Merge pull request #122 from twpayne/default-tile-size

Add default tile @define, refs #114, fixes #120
Add canvas checks
Add canvas renderer
Add canvas renderer to side-by-side demo
Add canvas renderer to two layers demo