make config_dev.yml a valid YML file

`%..%` must be wrapped by quotes, or YML file is not valid!
bug #687 make config_dev.yml a valid YML file (jdespatis)

This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes #687).

Discussion
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make config_dev.yml a valid YML file

`%..%` must be wrapped by quotes, or YML file is not valid!

Commits
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848b095 make config_dev.yml a valid YML file
Merge branch '2.5'

* 2.5:
  make config_dev.yml a valid YML file
updated VENDORS for 2.5.3
Add a HiDPI favicon.
Add RewriteRule
Fixed version in links
Allow bundles without a vendor
minor #703 Fixed version in links (zomberg)

This PR was merged into the 2.5 branch.

Discussion
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Fixed version in links

Commits
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00c780a Fixed version in links
Merge branch '2.5'

* 2.5:
  Fixed version in links
  updated VENDORS for 2.5.3
updated version in README for 2.6
updated VENDORS for 2.5.4
[Console] filter doctrine log with -vv cli option
Enable DebugBundle
Improve pdo_sqlite using info
minor #711 Improve pdo_sqlite using info (aivus)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #711).

Discussion
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Improve pdo_sqlite using info

1. Line with `path` declaration should be uncommented in config.yml for use `database_path`
2. Line with `database_path` declaration should be uncommented in parameters.yml.dist, because any composer commands (which call `post-install-cmd` or `post-update-cmd`) remove `database_path` from parameters.yml

Commits
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f1aa7f8 Improve pdo_sqlite using info
Merge branch '2.3' into 2.4

* 2.3:
  Improve pdo_sqlite using info
Merge branch '2.4' into 2.5

* 2.4:
  Improve pdo_sqlite using info
Merge branch '2.5'

* 2.5:
  Improve pdo_sqlite using info
  updated VENDORS for 2.5.4
feature #707 [Console] filter doctrine log with -vv cli option (lyrixx)

This PR was merged into the 2.6-dev branch.

Discussion
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[Console] filter doctrine log with -vv cli option

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

I add this configuration to all my projects. So I think it could be the default
behavior fore everyone.

Why?

When you write commands and you use lot of log in your application with the
`debug` log level; you have to use `-vvv` option to see them. But with
`-vvv``option, doctrine log is also output. This is a bit annoying because it
becomes very hard to filter your log from doctrine log.

How?

So with this patch you get all logs with `debug` or higher log level, except
doctrine log with `vv` option. And you get all logs with `-vvv` option. With
only `-v` option, you get only `info` or higher log level.

Commits
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138065d [Console] filter doctrine log with -vv cli option