Modify output for 'help' command

Modify output for 'help' command to make it an actual sentence, and to use link formatting for StackExchange Chat so that it displays "here" as a clickable link to the "Interacting with the Bot" document for the bot here on Github.
Fix SEChat syntax error in help command
Merge pull request #106 from teward/patch-1

Modify output for 'help' command