This Fixes #900
This Fixes #900

Missed this function while merging
This Fixes #900

Added dependency for sendmailR package
This Fixes #900
This Fixes #1115 : Trimmed all whitespaces present in text box for notebook id
This Fixes #900

Added entry for sendmailR package in imports.
This Fixes #900 : Formatting correction for spaces
This Fixes #900 : Defaulted the comment notification subscription to false.
This Fixes #900: added space.
This Fixes #900: Again fixing merge issue
This Fixes #1083

Saving notebook forcefully before fork.
This Fixes #1115 : Trim notebook id as well as version
make whitespace trimming consistent
Merge branch 'pr/1123' into develop
Merge branch 'pr/1131' into develop
Merge pull request #1119 from sujitbehera27/comment-notify-900

New PR  which Fixes #900 for comment notification to users.