Add engine tests for Mono
including linux as os
adding xunit 1.9.2 bins
adding xunit project
adding travis running xunit tests
removing for now notifications
fixing dir point to correct xunit-1.9.2
configuration set to debug
running tests after_success
check after_script
making build.sh executable
Revert "running tests after_success"

This reverts commit d2d9a7970a4dc0fc7403c63fb88efb0aa76d7533.

Conflicts:
	.travis.yml
leaving only ScriptCs.Core and acceptance tests
Merge remote-tracking branch 'origin/xUnitProj' into xUnitProj