feed items repository is cached
cache introduced
static finals for GAE implementations of interfaces
cache implemented for all repos
misprints fixed
read items repository cached now. cron interval set to 1 minute
read items cache was turned on
alarm commit
feed items repository interface was changed
CachedFeedItemsRepository with tests
CachedFeedUpdateTaskSchedulerContextRepository was moved to diff package. GaeCache was renamed to MemCache