Update generate_test_runner.rb

Bug - compilation error when using parametrized tests with user defined types. When using TEST_CASE and parametrised test and passing parameters which are of user defined types, the test_runner does not compile because it does not recognize the user defined types.
Test runner should copy the include statements from the test file
Merge pull request #44 from shellyniz/master

copy include statements from test file to test runner (excluding cmock.h and unity.h) to better handle custom types in parameterized tests (Thanks Shelly)