added gruntfile and package.json for appcache generator
added gruntfile for grunt-manifest
added gitignore
added utils/appCacheManager.js - helper lib
added sample manifest.appcache file
initital commit
added images subdirectory to samples to make appcache easier
generated new appcache. Mostly working. one 404
tweaked package.json
fixed minor typo
added error handling to estimateTileSize()
this works for basic reload
this version can be reloaded while offline with minor issues
remove duplicate code
updated readme
added sample documentation
minor tweak to helper ensure map shows up after reload
update offlineusage info when internet comes back up
better way to get the ceiling and floor zoom levels
offline indicator now works properly on reload