Historical Data enhancements and fixes

- 1 sec bar size works now
- HistoricalDataItem has a proper time.Time as the date (rather than a
string)
- Added tests for various bar sizes
Merge remote-tracking branch 'upstream/master'

Conflicts:
	types.go
move logic for handling hist data dates from ereader to wire
Add historical data manager
Add TODO reminders to ereader.go.