Added Ignore exceptions and castexceptions in all methods. Adde a lot…

… of tests. (#32)

* Fixed bug with decimals and date

* Added is_noe method

* Return None if cast fails

* str2decimal new method

* str2bool with new methodology

* Strbytes with new methods

* More cast methods

* More cast methods

* Changing guess in loads

* Added missing resturn to manage

* str2time works fine

* str2time Trying

* str2time works again

* time2str works

* str2date works

* str2dtnaive works

* str2dtawre works

* dtnaive2str works

* myjsonencoder works

* All myjsonencoder work

* Refactor to JsUtcIso

* Added timedelta2str

* Everython works

* Removed managed old functions

* Created all test_functions empty

* Removed innecesary comments

* Added test for dtnaive

* Removed innecesary comments

* Fixed bug with decimal