* Redo JSitor
- can now accept full url with params
- added more test
- redo jsitor guide
* Jsitor redo guide
- moved below JSFiddle
- add more instructions
* Refactor JSitor liquid tag
- Change the iframe size to 400
- can accept ID with or without params
- added ID_REGEX to check for id
- add more information on error
- added more test
- test for id with invalid link
- test for id with params
- test for id without params
* Refactor
- simplified regex, removed unnecessary groupings
- changed method name from link_valid? to validate_link
- changed error message
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