feat(date, time): Add objects for Date and Time

These two objects are particularly helpful for defining EnergyPlus schedules and there may be some other places where it is helpful to have these objects coordinated with the Ladybug DateTime and AnalysisPeriod as they are here.

This commit also adds a full set of tests for DateTime, Date, and Time.  It also includes a few corrections to places where we were internally using hasattr instead of isinstance.

ladybug/analysisperiod.py

@@ -165,7 +165,7 @@ def from_analysis_period(cls, analysis_period=None):
  """
  if not analysis_period:
  return cls()
- elif hasattr(analysis_period, 'isAnalysisPeriod'):
+ elif isinstance(analysis_period, AnalysisPeriod):
  return analysis_period
  elif isinstance(analysis_period, str):
  try:
@@ -447,11 +447,8 @@ def __eq__(self, other):
  if isinstance(other, self.__class__):
  if (self.st_time, self.end_time, self.timestep, self.is_leap_year) == \
  (other.st_time, other.end_time, other.timestep, other.is_leap_year):
- return True
- else:
- return False
- else:
- return False
+ return True
+ return False
 
  def __ne__(self, other):
  return not self.__eq__(other)