Add support for Ends Concurrent with Start and Starts Concurrent with End
hidden title elements from the SR
removed redundant 'start' and 'end'
moved aria tags to down to modal-dialog div
Update version of health-data-standards
Merge pull request #273 from projecttacoma/concurrent_with_measure_period

Add support for Ends Concurrent with Start / Starts Concurrent with End
added closing quote
Patient builder validation doesn't allow two digit years
Merge pull request #281 from projecttacoma/validate_two_digit_years

Patient builder validation doesn't allow two digit years
Changed main page title to "dashboard" for consistency
Merge pull request #276 from projecttacoma/title-hidden

hidden title elements from the SR
Merge pull request #277 from projecttacoma/start-stop

Start stop
Validate dates in patient and data criteria
Data criteria stop dates are optional; fixed an incorrect comparison
Merge pull request #282 from projecttacoma/validate_dates

Validate dates in patient and data criteria
Fix data criteria date validation typo for 2 digit year check
Merge pull request #283 from projecttacoma/validate_dates_bugfix

Fix data criteria date validation typo for 2 digit year check
replace stray glyphicons with appropriate font-awesome icons
Hiding icons for screen readers
Slight refactoring to separate sr-only text from hidden icon