Use leapSeconds() for TAItoUTC()
Merge remote-tracking branch 'origin/master'

* origin/master:
  Add missing documentation of dateToJD.
  No leap seconds announced in C 48. Update DUT1.
Fixes broken test case
Fixes even more broken test cases in node 0.11.

Node 0.11 apparently uses a version of v8 that made changes to it’s math
functions (most likely sin, cos, tan, etc.).
Increased the delta on the test cases.