If the `dst_cache` slice is empty, the program panics when trying to access `dst_cache[0]`
added a `if len(dst_cache) > 0 {}` block around the use of that variable to prevent that panic.
* Initial attempt at app pool collector
* Rename and tweak
* Attempt to convert uptime to unix timestamp
* Merge app pool metrics with existing IIS modules
* Update comments to reference new class
* Add state label to CurrentApplicationPoolState metric
* Return 0 value metrics for all non-active app states
Return 1 for active state
* Remove unnecessary float cast
* Add calculation for uptime
* Convert iis uptimes to unix timestamps and alter help msg
* Rename application pool uptime to start_time
