Merge pull request #147 from ryanttb/b2

updated docs, demos, and also: geomap - [bug] find method does not work on all Multi* geometries
Merge branch 'master' of github.com:AppGeo/geo into b2
Merge pull request #148 from ryanttb/b2

mostly double buffer fixes
Merge branch 'master' of github.com:AppGeo/geo into b2