Implement QuoteStrategy on SqlWalker walkRangeVariableDeclaration

Based on:
http://www.doctrine-project.org/jira/browse/DDC-1845
https://github.com/doctrine/doctrine2/commit/cb72219b118c158c9b5344c4b81ff2b1a9149ab0
Adding simple test to ensure quoting of table names still functions.  Note: the funtionality of this change won't be noticiable unless a custom quote strategy is implemented
updating sql walker to use quote strategy in joins
updating sql walker to use quote strategy in joins
Merge pull request #688 from sellingsource/master

Implement QuoteStrategy on SqlWalker walkRangeVariableDeclaration