Easy ascendant calculation

[TheMascot]

Dear @commenthol!

As my connecting issue states,
#37
I wrote a function to calculate the ascendant based on the observer's location on Earth and the exact time. Furthermore a basic location format converter for easier use.
Added a test file too in the test folder and npm test runs green.

I would be honored to contribute to your library.

[TheMascot]

I forgot to deal with the local time difference that is created using the new Date() constructor in JavaScript in different timezones. I thought this through several times in the past days and pretty sure this causes the problem. Have to convert to UTC than work with that. I plan on fixing it this week. Sorry for the buggy pull request.

[TheMascot]

I tested my theory and npm test returns with errors if I modify the timezone in the OS from my original one.
However I tested with separate astrology charting programs, modifying the place of birth and the timezone in the OS, the output ascendant degree is correct. So the code is ok. The test has to be modified to represent always the exact time of the given coordinates.