Improve access methods
More flexible setter for calendar modes
Fix tests calling CALENDAR constants
Merge pull request #52 from matthewrmshin/data-func

More flexible API for calendar mode
Fix floating `day_of_month`

On adding a `TimeInterval` to a `TimePoint`. The `day_of_month` should
be an `int`, not a `float`.
Merge pull request #53 from matthewrmshin/fix_floating_day_of_month

Fix floating day_of_month
fix error message from badly formatted duration
#55: replace the unicode plus or minus sign
use +- instead of ~
Merge pull request #54 from benfitzpatrick/fix-interval-bad-parsing

Fix error message from badly formatted duration
#55: replace "+-" with "+"
Merge pull request #56 from benfitzpatrick/55.replace-unicode-plus-or-minus-sign

#55: replace unicode plus or minus sign with ascii-compatible form
Update CHANGES.md
Release 2014.07.0
add year range speedup
update following review feedback
Merge pull request #57 from benfitzpatrick/add_year_range_speedup

Add year range speedup
add bounds error for year dumping
fix error raising bug
Merge pull request #58 from benfitzpatrick/dumper.add-year-bounds-error

Add bounds error for year dumping