Update README.md

https://github.com/eternicode/bootstrap-datepicker/issues/451
Added Portuguese clear and Totday literals
fixed typo
Added test case to show issue with noConflict().
Refined test case to show issue with noConflict().
Fixed issues with undefined defaults and locale_opts after calling noConflict().
Readme typo
Add missing 'today' translation
Fixed 'today' translation. Add 'clear' translation.
Further protection against infinite loops in parseDate

Fixes #512
Merge pull request #496 from fjmilens3/bug/noconflict-settings

Unit test/fix for issues with noConflict()
Added proper Turkish date format
Merge pull request #514 from frapontillo/master

Added Turkish date format
Merge pull request #508 from donnyreza/patch-1

Add missing 'today' and 'clear' translations
Merge pull request #495 from kappy/feature/pt-locale-update

Added Portuguese clear and today literals
Merge pull request #454 from waynebrantley/patch-1

Update README.md to add a link to the demo page