Add offset option

- Can set the height offset to display below another element fixed to the page, like a sticky header
- Update readme examples
- Bump version

Fix EnzoMartin#3

- Fix support for Firefox
- Add bower

Support some cases where style is undefined

Linting

Act on container height changes

- Fixes EnzoMartin#1
- Bump to 1.0.0
- Replace usage of jQuery functions to native functions
- Use single ticks instead of mixed double quotes and ticks
- Change the throw error to a console.error
- Add a setInterval check that checks each sticky instance's container height to see if it changed and needs to have it's boundaries updated
- Add CSS animation option
- Document methods and options better
- Add minified file
- Remove useFixed entirely, only relies on relative positioning now

Merge branch 'master' of github.com:EnzoMartin78/Sticky-Element