tests

From now on all unit tests are passing on all important and modern php branches:

* 5.3.x (last tested on 5.3.28)

* 5.4.x (last tested on 5.4.31)

* 5.5.x (last tested on 5.5.18)

* 5.6 (tested on 5.6.0RC3, but I’m sure nothing big will be changed in release)

* HHVM 3.2

Important note is that HHVM is really faster when running with common website.

I see about 50% of speedup gain on real YF-based project.

Useful links:

* YF travis-ci (5 php branches tested too): https://travis-ci.org/yfix/yf

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