Adds http:// in View Web Page URL by default. fixes #4

If url does not contain http:// or https:// at the beginning, appends http:// by default.
Merge pull request #6 from apeeyush/ViewWebPage

Adds http:// in View Web Page URL by default. fixes #4
Prevent crashing on display of map when there are data but no lat and long attributes.
Improve handling of data context changes.
In addMap, pass the data context in after initialization so as not to wipe out function property.
Get rid of map.googleapis.
Remove init and destroy as superfluous
Remove reference to maps.googleapi
Merge branch 'master' of https://github.com/concord-consortium/codap
Build 0246
Merge conflicts