adds initial alerts documentation; fixes bug in IMQ API reference
adds missed queue alerts documentation file
renames alerts params
alerts update
adds right sample request for get message by ID
Update index.md
Merge pull request #387 from iron-io/imq-alerts

Initial documentation for IMQ Alerts. Fixes IMQ API reference. Do not merge please.
minor change from delay to snooze
removed excess margin on overview header
screenshots and imags of where the queue alert is located in hud
fix typo in table
small change to alerts overview
fixes documentation
Merge pull request #390 from featalion/imq-alerts

fixes documentation
updates documentation
adds important notes to queue alerts page
Merge pull request #391 from featalion/imq-alerts

updates documentation
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