Removed info about built-in apps

See https://github.com/substantial/choosy/issues/9
Deleted data to test proper cache refresh
More deletions for more testing :)
More testing
Revert 07e1afb..dbe0004

This rolls back to commit 07e1afb6b6cf30fbfdcc866fea306038309c3ade.
Removed data about all built-in apps, redundant

See https://github.com/substantial/choosy/issues/9
Fixed typo in gmail url format
Added note about new merge feature
Minor readme change
Merge pull request #7 from gamenerds/master

Removed all data about built-in apps as per new merge feature