Adds HelpRequest Handler

[iwishiwerearobot]

Adds a basic handler for presenting the Slack user with a dialogue to request help for a service

[adampointer]

As this effectively supersedes handlers.DialogTest can you remove the former and update the reference to it in main.go to point at your new handler please?

[coveralls]

Pull Request Test Coverage Report for Build 66

• 0 of 9 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 31.25%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
main.go	0	1	0.0%
handlers/handlers.go	0	8	0.0%

Totals
Change from base Build 58:	0.2%
Covered Lines:	40
Relevant Lines:	128

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💛 - Coveralls