SwiftExample app: First row of days starts with the last week of the last month in some cases

[h-bomb]

In the SwiftExample app, if you navigate to a month where the first day of the month lands on a Sunday, the first row of days starts with the last week of the last month but should start with the first day of the currently selected month. See attached screen capture.

Steps to reproduce:

1. Launch the latest version of SwiftExample.
2. Select FSCalendarScope. (Note that the issue exists in other options, as well.)
3. Navigate to a month where where the first day of the month lands on a Sunday. Example: January 2017, October 2017

Results:

The first row of days starts with the last week of the last month.

Expected:

The first row of days should start with the first day of the currently selected month.

• Tested in: iPad 2 Air / iOS 10.0.2 device, iPad Pro 9.7" / iOS 10.2 simulator
• Xcode 8.1.2
• FSCalendar 2.7.0 / development branch
• Issue discovered in SwiftExample

[WenchaoD]

@h-bomb Actually I made this symmetric on purpose. I though it looks better, isn't it?