Unparser test for subquery with limit/offset
NodeToString helper for ORDER BY/LIMIT/OFFSET and use for SubqueryNode.

Fixes #100
Update readme extension in ignore list
merge nathanlws: Include LIMIT/OFFSET in Subquery NodeToString

Merge pull request #102 from nathanlws/sql-parser/fix-node-to-string-subquery-limit
https://github.com/FoundationDB/sql-parser/pull/102
Add tests for the choice conflict.
Need LL(2) to decide what to do about NOT here.
merge MMcM: Parsing ambiguity in recent NOT DEFERRABLE clause

Merge pull request #103 from MMcM/sql-parser/not-deferrable-ll-2
https://github.com/FoundationDB/sql-parser/pull/103
Release 1.2.0
Bump version to 1.3.0
merge nathanlws: Bump version 1.3.0

Merge pull request #104 from FoundationDB/sql-parser/bump-version-1.3.0
https://github.com/FoundationDB/sql-parser/pull/104