Remove unused use statement
[DDC-2655] Don't let getOneOrNullResult throw NoResultException
Merge pull request #780 from terite/DDC-2655

[DDC-2655] Don't let getOneOrNullResult throw NoResultException
Removed "minimum-stability" : "dev" from composer.json
Clarified tutorial context around introduction of `orm:schema-tool:*` commands

See: http://stackoverflow.com/questions/17473225/doctrine2-no-metadata-classes-to-process for evidence of this confusion
further tweaking of last commit
further tweaking of last commit pt.2
Merge pull request #817 from mfdj/patch-1

Removed "minimum-stability" : "dev" from composer.json
Fixes a Fatal Error when using a subexpression in parenthesis

When some dql contains a subselect with expression in parenthesis, the
expression of the $simpleSelectExpression parameter given to
walkSimpleSelectExpression is an instance of AST\ParenthesisExpression.
Before this commit, this case defaulted to
$this->walkEntityIdentificationVariable($expr) where $expr is supposed
to be a string. A fatal error was then yielded.
Merge pull request #819 from vbourdeix/master

Fixes a Fatal Error when using a subexpression in parenthesis
Merge pull request #818 from mfdj/master

Clarified tutorial context in section introducing `orm:scehma-tool:*` commands
Fixed documentation rendering

The 2 lists I've fixed render as citation in the docs: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/index.html

If I didn't make any mistake, now they should render as simple lists.
Merge pull request #821 from mnapoli/patch-4

Fixed documentation rendering
Merge pull request #815 from nicolas-bastien/patch-2

Remove unused use statement
s/PostgreSQLPlatform/PostgreSqlPlatform/
Merge pull request #824 from brikou/patch-3

s/PostgreSQLPlatform/PostgreSqlPlatform/