Fix empty popup on Internet Explorer
build
detecting retina displays, adjusting tileSize
correction: window.devicePixelRatio > 1 becomes false even if devicePixelRatio is undefined
detectRetina is optional (false by default) to prevent map features (like city titles) from being too small to read on retinal tiles
adjust zoom levels as well (otherwise markers seem mispositioned)
includes fixes provided by Max Ogden
Prevent the default action and stop propagation when the layers control is expanded.
ie6 filter clearing fix
Merge pull request #667 from tagliala/ie6-filter-fix

ie6 filter clearing fix
this.edit is not always set for polygons - this happens to us for example when loading from geojson.  This patch makes sure that this.editing is set before checking whether editing is enabled.
Merge pull request #669 from cfis/editingFix

Check this.edit is set
Fix feature detection for IE9 when drawing SVG paths
Merge pull request #671 from naehrstoff/patch-1

Fix feature detection for IE9 when drawing SVG paths
Merge pull request #586 from Mithgol/master

Detect retina displays and adjust tileSize accordingly
limitExecByInterval fixes
CR LF -> LF
Make any Circle visible even on low zoom levels
Fixing indentation so that Leaflet compiles.
Converting spaces to tabs for consistency.