Add getStats()

getStats() allows at any point to retrieve a Dict with the numbers of
successes, failures, errors and failures+errors.

This allows to put a `exit(getStats()["nNonSuccessful"])` as the last
line in `test/runtests.jl` to indicate to the outside world (for
example travis) whether the tests were successful.
Set up travis and add travis build status to Readme

This shows how to use FactCheck.jl with travis
Cleanup

also triggers travis
Make 1 test fail to test travis build
Make travis pass again - travis seems to work
Added readme section on Travis
added exitWithTestStatus()

just a nice-looking shortcut to exit(getStats()["nNonSuccessful"])
fixed typo
exitWithTestStatus -> exitstatus
Travis: use my email address and repo
Merge #16 - Hook up FactCheck to Travis

Conflicts:
	README.md