v1.1.0

Changelog:

• New Subject class models a chart native or partner, and accepts a date and coordinates.
• Chart classes now only accept an instance of Subject instead of direct dates and coordinates.
• Chart classes no longer return date & coordinates properties, and instead return native / partner properties of type Subject, which contain the date & coordinates.
• Composite MC-based house calculation has been removed due to being overly complex and error-prone when dealing with house-based objects. Composite chart is now 100% midpoint-based.
• Synastry chart has been removed, and instead a new aspects_to parameter has been introduced into each chart's constructor, which accepts a chart instance of any type and calculates the main chart's aspects to it. Synastries now consist of two separate chart instances, one of which aspects the other.
• Transits chart has been introduced, which is an easy shortcut to a natal chart of the present moment.