fix support for Symfony 2.3
Merge pull request #30 from sstok/patch-1

fix support for Symfony 2.3
add option empty_value to Doctrine/ColumnTypeExtension
fix attention and modify entity field docs
fix attention and add example to entity doc field with empty_value as string
Merge pull request #31 from zdebol/master

Added option empty_value to entity column type
Resolved issue #33
Unified docblocks
Merge pull request #35 from norzechowicz/docblocks

Unified docblocks
Merge pull request #34 from chives/dev

Resolved issue #33
Added formatting options to number field.
Fixed TreeTypeTest.
Merge pull request #36 from beregond/numberformat

Added formatting options to number field.
Fix docs and typos.
Further typo improvements.
Fixed doc string.
Added todo tag.
Merge pull request #37 from beregond/typo

Fix docs and typos.
Correction of comments.
Merge pull request #38 from beregond/cleanup

Correction of comments.