Fixed innacurate expression

"deben" means "it must be" while "deben de" is more like "it seems to be"

http://castellanoactual.com/deber-o-no-deber/
Fix typo in PSR-3-logger-interface.md
Format line lenght to respect PSR-2
Add title
Create PSR-4-autoloader in Fr
Update PSR-4-autoloader-meta.md
[PSR-7] Removed references to RFC 2616

- RFC 7230 describes HTTP messages, while RFC 7231 describes specifically
  request and response messages.
[PSR-7] Clarify MessageInterface::getHeaders()

- Per [the mailing list](https://groups.google.com/d/msg/php-fig/H_NR7qctw-8/9jDffi4_j7cJ), clarified the return value of `getHeaders()` to indicate the structure of the returned array.
[PSR-7] Fixed defintion of a HTTP message

Http messages do not consist of requests, they are the request.

Also not sure whether the second paragraph should be a list. It has only one item.
Removes trailing spaces from proposal
Merge pull request #346 from weierophinney/hotfix/reason-phrase-reference

[PSR-7] Remove references to RFC 2616
Merge pull request #351 from sagikazarmark/hotfix/trailing-spaces

[PSR-7] Removes trailing spaces from proposal
[PSR-7] Clarify MessageInterface header methods

- Ensured that `(add|set)Headers?()` docblocks are consistent in the following:
  - what arguments can be expected (add and set variants should allow the same arguments).
  - detailing that object header values MUST be cast immediately.
- Added `clearHeaders()` method for clearing all previously set values. (see https://groups.google.com/d/msgid/php-fig/05dd990a-459e-4fa4-8617-04b820da51eb%40googlegroups.com for details)
- Modified `setHeaders()` description to indicate it will not reset headers, but
  instead overwrite those that exist, while leaving any not specified to the
  method intact.
[PSR-7] Clarify superglobals/query parameters

- Updated docblocks for query, cookie, and file parameters to indicate that the
  data sources MAY come from superglobals, or MAY come from other sources, but
  MUST mimic the structure for the corresponding superglobal.
- Clarified that when injecting query parameters manually from values parsed
  from the URI, the rules that PHP's parse_str() follows MUST be followed.
[PSR-7] typos
Merge pull request #324 from vladimirmartsul/patch-1

Update PSR-4-autoloader-meta.md
Merge pull request #319 from garygitton/master

Improve French Accepted PSR
Merge pull request #228 from ggam/patch-1

[Spanish Translation] Fixed innacurate expression
Merge pull request #250 from dave1010/patch-4

Fix typo in PSR-3-logger-interface.md
[PSR-7] Removed all plural header methods

- Removed:
  - addHeaders()
  - setHeaders()
  - clearHeaders()
- For addHeader() and setHeader(), clarified that the methods accept only
  strings or arrays of strings.