Arrow

-----

- [NEW] ``Arrow.replace`` method
- [NEW] Accept timestamps, datetimes and Arrows for datetime inputs, where reasonable
- [FIX] ``range`` and ``span_range`` respect end and limit parameters correctly
- [CHANGE] Arrow objects are no longer mutable
- [CHANGE] Plural attribute name semantics altered: single -> absolute, plural -> relative
- [CHANGE] Plural names no longer supported as properties (e.g. ``arrow.utcnow().years``)

-----

- [NEW] Support for localized humanization
- [NEW] English, Russian, Greek, Korean, Chinese locales

-----

- **REWRITE**
- [NEW] Date parsing
- [NEW] Date formatting
- [NEW] ``floor``, ``ceil`` and ``span`` methods
- [NEW] ``datetime`` interface implementation
- [NEW] ``clone`` method
- [NEW] ``get``, ``now`` and ``utcnow`` API methods

-----

- [NEW] Humanized time deltas
- [NEW] ``__eq__`` implemented
- [FIX] Issues with conversions related to daylight savings time resolved
- [CHANGE] ``__str__`` uses ISO formatting

-----

- **Started tracking changes**
- [NEW] Parsing of ISO-formatted time zone offsets (e.g. '+02:30', '-05:00')
- [NEW] Resolved some issues with timestamps and delta / Olson time zones