ES6 modules & Rollup (#4989)
* WIP ES6 modules & rollup
* WIP ES6 modules & rollup 2
* WIP ES6 modules & rollup 3
* WIP ES6 modules Browser
* WIP ES6 module fixes
* WIP ES6 modules: simpler browser exports
* WIP ES6: refactor CRS/Projection modules, CRS obj -> CRS.Base
* get rid of unnecessary index.js
* WIP ES6 modules, dom events and stuff
* Make linter happy, rollup to dist/
* revert to CRS namespace/class for now
* WIP rollup: export more stuff
* export controls
* rollup: export Layer
* rollup: export DomEvent
* rollup: export more layer types
* rollup: export Popup/Tooltip
* WIP: ES6-ify marker, icon, domutil, draggable.
* ES6-ify gridlayer, tilelayer.
* ES6-ify: Tweak imports-exports, code is now runnable!!
* ES6-ify: Fix scope in some DomUtils
* ES6-ify: Path, fix Popup
* ES6-ify: Lint & cleanup
* ES6-ify map handlers, more linting
* ES6-ify: Icon.Default namespacing
* ES6-ify: Renderers, CircleMarker
* ES6-ify: Circle, Polyline, LineUtil
* ES6-ify: Polygon, Rectangle, LineUtil, PolyUtil, linting
* ES6-ify: SVG.VML
* ES6-ify: DomEvent.Pointer, DomEvent.DoubleTap
* ES6-ify: Linting, make Karma play nice with Rollup
* ES6-ify: More work on fixing bits breaking some unit tests.
* ES6-ify: rollup the version number, fiddled with build scripts
* ES6-ify: Fiddle with test scripts
* ES6-ify: cleanup (refs to global L, imports from (DOM)Util), prevent cyclic loop on Map imports
* ES6-ify: More cleanup of (DOM)Util/Browser/DomEvent imports
* ES6ify: Use rollup's "legacy" option for ES3 (IE8) builds
* ES6-ify: Clean up build scripts, fix CONTRIBUTING.md instructions
* Typo
* ES6-ify: minor fixes and lefovers after rebasing on top of 1.0.2
* ES6-ify: upgrade to rollup 0.38 for proper IE8 builds, fix L.SVG.VML
* Make linter happy.
* ES6: Fixing typos and sxrew-ups after big rebase
* Fix symlink for debugging scripts
* ES6: Cleanup old build scripts
* ES6-ify: Update build system to include git rev in L.version
* ES6-ify: re-enable unit tests replacing L.Path with L.Polyline
* Export Path
* ES6ify: cleanup old banner file
* ES6-ify: whitespace in var declarations
* ES6-ify: Export toTransformation as L.transformation
* ES6-ify: cleanup L.transform exports
* ES6-ify: "import Util" in Transformation and SVG.VML
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