Upgrade TZ database to `tz2013c`.

The `zic` compiler is not correctly parsing Antarctica/Macquarie causing
it to miss the initial transition from uninhabited to (A)EST. The Ruby
test that verifies the Timezone compiler against the `zic` compiler has
been modified to skip Antarctica/Macquarie prior to 1917.

Timezone is parsing this zone information correctly.

Closes #156.