travis-hx support

Hello.

I added console_log compiler flag, which turn on native flash/js trace.

All targets expect as3 works perfect, https://travis-ci.org/profelis/bindx2/builds/41169963.
As3 target fail in promhx library (issue is open)

.travis.yml example file https://github.com/profelis/bindx2/blob/master/.travis.yml
lines 18 and 58 are important