Fix exception raised due to time zone offset transition for Brazilian time zone.

In Brazil, DST clock shifts occur at midnight, so some instants generated by IndexArbitraries were invalid.
Pass America/New_York time zone to constructor.
Merge pull request #60 from andrelfpinto/fix-instants-brazil

Fix exception raised due to time zone offset transition for Brazilian time zone
Bump versions
Bump travis versions
Merge branch 'master' into RRuleStringContructor