KB-430 Allow for additional date input format, MM/DD/YY to stats report
KB-432 Stats report minDate. Validate/fix date input. Provide alert on bad input

Usage minDate is 2008 Jan 1, Growth goes back to 2003, when first submission
Give out an alert/notice in case bad date input.

Also, had to switch from using jqueryUI-datepicker-accessible to the main.
Merge pull request #7 from osulibraries/stats-error-handling

Stats error handling