leaflet 0.7 release
hopefully improves things further, especially on kitkat
Merge pull request #653 from nexushoratio/to-push

Fix a couple of typos.
basemap cleanups
- updated Google, Bing and Yandex externals from https://github.com/shramov/leaflet-plugins
- also renamed Google file, removed internal hacks for INGRESS map type
- used external included file for Bing maps, instead of embedded in the plugin
- used Google map tile API to set the options for the INGRESS and 'Google Grey' map layers
cache bing maps metadata - without this likely to exceed free quota for map tiles
Merge pull request #654 from nexushoratio/to-push

Spell checking, a-c.
Merge remote-tracking branch 'upstream/master' into to-push