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set not removable output bufferization(to prevent headers sending)

Some "smart" frameworks are using `flush()` and `while(ob_get_level()) ob_end_flush();` calls to force output flushing, so headers are sent before script shutdown, so php-console can't send own headers.
v3.1 Release with more stable client-server protocol

Fixed: headers problem if flush() or ob_end_clean() is called before script shutdown
Fixed: problem with frameworks that overrides $_SESSION handler see https://github.com/barbushin/php-console#troubleshooting-with-_session-handler-overridden-in-some-frameworks
Migration: Update PHP Console extension to last version >= 3.0.20

[Fixes #34]
[Relative #36]
memcache storage fix

local variable replaced with class variable in constructor
Merge pull request #42 from rubensainiuc/patch-1

fixes Storage/Memcache (thanks to @rubensainiuc)
fixed ob_end_flush() error problem in  some not very smart frameworks

Some frameworks like Drupal are calling ob_end_flush() without checking that output buffer is not marked as PHP_OUTPUT_HANDLER_FLUSHABLE, so they get E_WARNING. Because PhpConsole now is using more smart communication protocol that is not so critical about headers flushed before script shut down, so there is no more need to use not removable ob_start().
Handler::getInstance()->debug() now works without Handler::getInstance()->start()
"php-console/laravel-service-provider" suggestion in composer.json
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Added: flush debug messages buffer before proceed eval request
Fixed: jQuery is loaded check in example
Closes #40
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Added link to Silex service provider
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Update composer.json
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reduce postpone requests limit to stop OOM errors
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