added a check to getkernels so that the kernels are not downloaded if they are already in the current working directory.
test_utc2et added. follows icy example. icy utc2et example gives 1.55185520 as output, SpiceyPy utc2et gives 155185515.1831043.
Merge pull request #15 from johnnycakes79/master

utc2et test and kernel checking added by johnnycakes79