Regtests on the CI (#244)

* submodule and test script

* proper grep pattern

* travis config

* build in advance

* remove error! and fix grep

* use intermediate file

* use package with java, not jdk

* use minimum cache

* add summary delimter

* fixed regtests broken in 9e53289b

* clear output

* remove old submodule

* updating tool

* remove from .gitmodules also

* more convinient log output

* travis fold labels