updating tests
Uninstall xctool on Travis before installing it again

Attempt to fix broken build because of "Error: xctool-0.1.7 already installed".

https://travis-ci.org/mysterioustrousers/MTDates/builds/10717206
updating readme
updating readme
Merge pull request #30 from yas375/patch-1

Uninstall xctool on Travis before installing it again
working on tests
getting rid of unnecessary lock object
getting rid of lock object for @synchronized