v0.10.0

Feature release for cycler. This release includes a number of new
features:

• Cycler objects learned to generate an itertools.cycle by calling
  them, a-la a generator.
• Cycler objects learned to change the name of a key via the
  new .change_key(old_key, new_key) method.
• Cycler objects learned how to compare each other and determine if
  they are equal or not (==).
• Cycler objects learned how to join another Cycler to be
  concatenated into a single longer Cycler via concat method of function.
  A.concat(B) or concat(A, B).
• The cycler factory function learned to construct a complex Cycler
  from iterables provided as keyword arguments.
• Cycler objects learn do show their insides with the by_key method
  which returns a dictionary of lists (instead of an iterable of dictionaries).