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