fixes #19 to successfully run tests on simulator with non-default locale
Added config file for xctool

Now you can run tests just with `/path/to/xctool.sh test`. No need to
specify project and scheme.
Added config for Travis CI
Make MTDates scheme shared

Without it tests can't be run on Travis CI because scheme can't be
found.
Added Travis CI build status image
Merge pull request #21 from jeddison/issues/19

oops, sorry for taking so long. thanks for this.
Merge pull request #22 from yas375/travis-ci

Added integration with Travis CI
Update README.md
Added mt_dayOfYear method, along with tests

Note: approach was taken from http://stackoverflow.com/questions/2080927/how-do-you-calculate-the-day-of-the-year-for-a-specific-date-in-objective-c
Merge pull request #23 from jeddison/feature/dayOfYear

nice!!
Use firstWeekday and from current calendar if not set

And minimumDaysInFirstWeek also used from current calendar as well.
Merge pull request #24 from yas375/calendar-settings

Use firstWeekday and from current calendar if not set
Use correct methods in some tests
Merge pull request #25 from yas375/fix-tests-for-weekday-symbols

Use correct methods in some tests
Use `STAssertEqualObjects` instead of `STAssertTrue`
Merge pull request #26 from yas375/update-assetions

Use `STAssertEqualObjects` instead of `STAssertTrue`
adding macosx as a supported platform
updating project settings
updating shared data
adding -all_load linker flag