Add xdebug.max_nesting_level recommendation

The Xdebug extension includes infinite recursion protection, which throws a PHP fatal error if function nesting exceeds a configurable limit.

Unfortunately the default limit is so low that it is often exceeded in normal execution by symfony projects (especially in the dev environment). This triggers a panicked and futile search for a coding problem where none exists.

This commit adds a recommendation to increase the max_nesting_level limit above the default if Xdebug is loaded.
merged branch inanimatt/master (PR #75)

This PR was submitted for the master branch but it was merged into the 2.1 branch instead (closes #75).

Commits
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206b342 Add xdebug.max_nesting_level recommendation

Discussion
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Add phpIniRecommendation for xdebug.max_nesting_level limit

The Xdebug extension includes infinite recursion protection, which throws a PHP fatal error if function nesting exceeds a configurable limit.

Unfortunately the default limit is so low that it is often exceeded in normal execution by symfony projects (especially in the dev environment). This triggers a panicked and futile search for a coding problem where none exists.

This commit adds a recommendation to increase the max_nesting_level limit above the default if Xdebug is loaded.
fixed CS
fixed timezone check (closes symfony/symfony-standard#489)
Merge branch '2.1'

* 2.1:
  fixed timezone check (closes symfony/symfony-standard#489)
  fixed CS
  Add xdebug.max_nesting_level recommendation