set execute bit on test_file

b/c it is intended to be executed.
Merge pull request #170 from bodepd/update_test_scripts

update spec test script
Merge pull request #168 from bodepd/set_exe_bit

set execute bit on test_file
update travis to use the standard one

update travis ensures it tests
2.6,2.7,3.0,3.1 with ruby 1.8.7 and 1.9.3