Proposal for Github Style checkbox

[prateekjadhwani]

In github markdown, you can use the -[ ] code to create a checkbox. The proposal is something similar. Here is what it needs to do :

• Implement a checkbox when the user type -[ ] or -[x] or -[X]
• The checkbox id needs to be generated dynamically
• The checkbox value needs to be stored in localstorage so that the user can keep a track of it on his/her workspace.
• When the preview loads or reloads, it should grab the value of the checkbox id from localstorage and update it in the associated checkbox.

[pl86]

Hi, see my pull request #86 Live edit without using localstorage.