add optional TimeZone to Date.from and Date.to functions

• add optional timeZone to Date.from func
• add optional timeZone to Date.to func

add SPM support

add Swift Package Manager support

add math functions

add math functions for the following types
-year
-month
-weekOfYear
-day
-hour
-minute
-second
-millisecond

Add new Date Formats and migrate swift 5.0

1.1.0

migrate swift 5.0

.podspec bug fix, version update

1.0.1

.podspec update.

lib create

1.0.0

license and readme update