Grunt: fix bug in rjsConfig builder

- was overwriting the original base r.js config
  with each call to createRjsConfig
Leaflet: fix MarkerCluster bug when markers w/types are added
Reorganize package definitions
Leaflet package definition
AerisPolygon: use synchronous strategy loading
Stub leaflet AMD library in build
Grunt: define leaflet build packages
Remove todo file
minor: file reorganization (no code changes)
Remove templated version from *.md docs

- so we do not have to generate and commit new *.md docs
  for every release.
Update version to v0.3.4