Sample Requests feature

- Added functionality that allows users to send a sample request to some user-inputted URL using a new parameter "@apiSampleRequest".
- Added a new parser for "@apiSampleRequest".
- Created a form template to allow users to input values for the parameters of a specific API call that they specify in their code with "@apiParam". Also added functionality to allow the user to try out different URLs.
- Server response and error messages are dynamically displayed on the page.
- Updated usage of Twitter Bootstrap's scrollspy to allow for dynamic adding/removing of content.
- Added a utils folder to the template directory to allow for further expansion of functionality on the front-end.