Add Feeds patch for resolving PHP errors.

## Ready State: Yes

This pull request is related to the following JIRA tickets: [ICS-94](https://imagex.atlassian.net/browse/ICS-94).

This patch alters the Feeds module to resolve a bug related to
its integration with the way date_ical module passes
FeedsDateTime objects. This patch eliminates PHP errors related
to passing an object to a function expecting a string. At a high
level, this patch enables the ability to retrieve and map dates
from iCal feeds to Drupal date fields when using an iCal feed as
a Feeds source.

## Deployment Instructions

* Merge code.