* Request change
- Added specific error message
- changed jsitor to JSitor
- changed JSITOR_URL constant to URL_REGEXP
- added space between URL_REGEXP and initialize method
* created jsitor liquid tag
- created a jsitor_tag.rb for jsitor liquid core
- created partial (_jsitor.html.erb) for jsitor liquid tag
* created test for jsitor liquid tag
- created spec for jsitor liquid tag
- generated jsitor_liquid_tag.approved.html
* added suggestion change
- removed regex
- change the full link to embeddable id
- removed dead code(methods) due to change logic
- removed checking of link since embeddable id will be parse as string
- removed parts of the test
- change the guide explanation
* Added lazy loading on iframe
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