[SQL] SPARK-1661 - Fix regex_serde test

The JIRA in question is actually reporting a bug with Shark, but I wanted to make sure Spark SQL did not have similar problems.  This fixes a bug in our parsing code that was preventing the test from executing, but it looks like the RegexSerDe is working in Spark SQL.

Author: Michael Armbrust <michael@databricks.com>

Closes #595 from marmbrus/fixRegexSerdeTest and squashes the following commits:

a4dc612 [Michael Armbrust] Add files created by hive to gitignore.
efa6402 [Michael Armbrust] Fix Hive serde_regex test.