support PHP 5.4, 5.5, 5.6#4

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jessp01 wants to merge 13 commits intomkoppanen:masterfrom

Commits on Dec 24, 2015

- support PHP 5.4, 5.5, 5.6 [PHP7 support will be introduced soon]
Jess Portnoy
committed
additional argument added to zend_fetch_debug_backtrace() in PHP 5.4
Jess Portnoy
committed
clean.
Jess Portnoy
committed
Added TODO thought.
Jess Portnoy
committed
typo.
Jess Portnoy
committed
use constant for PHP_5_3_X_API_NO.
Jess Portnoy
committed

Commits on Dec 26, 2015

first commit for elasticsearch backend.
Jess Portnoy
committed
now support directive aware_elasticsearch.host, default is
Jess Portnoy
committed

Commits on Dec 27, 2015

.
Jess Portnoy
committed
- fix segfault
Jess Portnoy
committed

Commits on Dec 28, 2015