"revel package" uses tar.gz instead of .zip

Fixes #67
Update to point to new goconfig repo
Booking fix: Don't panic if the hotel is not found
Add application-wide date/time format

The binder will first try these formats when parsing time.Time arguments.
Add new template funcs "date", "datetime" to format time.Times in that way.
Binder: Add parsing of uint and float values
Merge remote-tracking branch 'origin/master' into template_helper
Handling of integers for pluralize added