added option to insert css into pre-defined styletag with id="sentine…

…l-css", bumped version number

fixes issue that moved pre-existing sentinel-css tag

added support for hardcoded style tag with id="sentinel-css"

bumped version number

bumped version number

Added 'sentinel-load' event, bumped version number

New version with improved handling for custom animations

* Removed support for `extraAnimations`
* Added support for custom animation names with "!" prefix
* Decreased payload size
* Bumped version number

bumped version number

first release