Updated gc_initialize() to latest API
Updated gc_initialize() to latest API

Removed the struct style of registering callbacks, using the set_() API

Using the authentication API for fetching username and password

git-svn-id: 85993595adea9501c3608f1a84298b90251c745e@6062 53f5c7ee-bee3-0310-bbc5-ea0e15fffd5e

luizluca/google-calendar