add profiling
factor of 3 speedup so far...
Merge branch 'master' into speed_up_tests
try Calendar class
intervals: add get_seconds method, standardize functionality, and tests
intervals: simplify interval dumping
Merge pull request #48 from benfitzpatrick/interval.get_seconds

TimeInterval class: add get_seconds method and input prettifying
isodatetime: speed up tests
tidy and remove profiling
Merge pull request #51 from benfitzpatrick/speed_up_tests

Speed up tests
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