DCOM-255: Add support for using TABS (for indentation) in DocBlock Annotations

[doctrinebot]

Jira issue originally created by user henrywood:

Apparently any annotation that contains at least one TAB character is ignored.

The reason/bug resides in \Doctrine\Common\Annotations\DocParser->findInitialTokenPosition() on line 351

// if the @ is preceded by a space or * it is valid

Thanks

[doctrinebot]

Comment created by @Ocramius:

[~henrywood] this seems to be easily fixable by using something like preg_match('/^(\\t](\\*)$/', $input[$pos - 1)): can you provide a PR?

I'm just not sure about the performance impact here.

Note that JIRA screws with my regex in the quoted text, as escape sequences don't match what I entered.

[guilhermeblanco]

This issue was moved to doctrine/annotations#78