Adds support for NSArray parameters to YapDatabaseQuery

Example:
[YapDatabaseQuery queryWithFormat:@"WHERE col IN (?)", anArray];

- Adds unit tests for YapDatabaseQuery
- Adds new unit test for YapDatabaseSecondaryIndex since it makes use of YapDatabaseQuery

Addresses issue #119
Merge pull request #120 from Tundaware/119-nsarray-query-parameters

Adds support for NSArray parameters to YapDatabaseQuery