Fix tests + enable text_heigh/ascender/descender font metrics. 

Hello Zaki,

Thanks for fixing build of the module. 

I have fixed tests: partially via re-generation test data and manually checking that it is OK, partially via obtaining correct values from **ftdump** (demo utility for FreeType2), and partially fixing them just because "the values seems to be so" (i.e. I have no external tools for validating them). 

Also I adjusted *height*, *ascender*, *descender* values to be the same as I got via ftdump. Previously, they were just zeros, and commended in tests. Now, the values seems to be more appropriate.

Let's resurrect the module! :)