[GH-372] [DDC-1845] QuoteStrategy

This issue is created automatically through a Github pull request on behalf of FabioBatSilva:

Url: https://github.com/doctrine/doctrine2/pull/372

Message:

1. 1. 1. QuoteStrategy

http://www.doctrine-project.org/jira/browse/DDC-1845

This patch fix some quote problems using a default quote strategy and allows users find solutions themselves for weird quote cases.

This DBAL PR shoud be merged to fix sqlite tests in : https://github.com/doctrine/dbal/pull/158

There is a lote of new method calls, the performance tests in sqlite are the following :

1. 1. 1. 1. My branch :
            ```
            . testSimpleQueryScalarHydrationPerformance10000Rows - 0.37292098999023 seconds
            . testSimpleQueryArrayHydrationPerformance10000Rows - 0.50411009788513 seconds
            . testMixedQueryFetchJoinArrayHydrationPerformance10000Rows - 1.1323919296265 seconds
            . testSimpleQueryPartialObjectHydrationPerformance10000Rows - 1.0243051052094 seconds
            . testSimpleQueryFullObjectHydrationPerformance10000Rows - 4.1673181056976 seconds
            . testMixedQueryFetchJoinPartialObjectHydrationPerformance2000Rows - 0.40403699874878 seconds
            . testMixedQueryFetchJoinFullObjectHydrationPerformance2000Rows - 0.873291015625 seconds
            . 99 CompanyContract: 0.023395
            . 99 CompanyContract: 0.019528
            . Memory usage before: 111715.53125 KB
            . Memory usage after: 110282.875 KB
            . Inserted 10000 objects in 5.5240259170532 seconds
            . 100 CmsArticle findAll(): 0.018410
            . 100 CmsArticle findAll(): 0.014157
            . 100 CmsArticle find(): 0.043304
            . 100 CmsArticle find(): 0.041451
            . 100 CmsGroup: 0.009315
            . 100 CmsGroup: 0.009239
            . 100 CmsUser: 0.024051
            . 100 CmsUser: 0.023655
            . Compute ChangeSet 100 objects in 0.040482997894287 seconds

. Time: 19 seconds, Memory: 261.50Mb

```

1. 1. 1. 1. Doctrine Master :
            ```
            . testSimpleQueryScalarHydrationPerformance10000Rows - 0.37668490409851 seconds
            . testSimpleQueryArrayHydrationPerformance10000Rows - 0.5009880065918 seconds
            . testMixedQueryFetchJoinArrayHydrationPerformance10000Rows - 1.131824016571 seconds
            . testSimpleQueryPartialObjectHydrationPerformance10000Rows - 1.037791967392 seconds
            . testSimpleQueryFullObjectHydrationPerformance10000Rows - 4.1992859840393 seconds
            . testMixedQueryFetchJoinPartialObjectHydrationPerformance2000Rows - 0.41158103942871 seconds
            . testMixedQueryFetchJoinFullObjectHydrationPerformance2000Rows - 0.86575293540955 seconds
            . 99 CompanyContract: 0.023206
            . 99 CompanyContract: 0.020555
            . Inserted 10000 objects in 5.4995818138123 seconds
            . 100 CmsArticle findAll(): 0.018785
            . 100 CmsArticle findAll(): 0.014160
            . 100 CmsArticle find(): 0.042067
            . 100 CmsArticle find(): 0.041076
            . 100 CmsGroup: 0.009478
            . 100 CmsGroup: 0.010591
            . 100 CmsUser: 0.023727
            . 100 CmsUser: 0.023073
            . Compute ChangeSet 100 objects in 0.040009021759033 seconds

. Time: 19 seconds, Memory: 260.50Mb
```