Merge branch 'sbl-dev' of git://github.com/struct-by-lightning/wpi-suite into sbl-dev
Validate email when user enters his/her email at the welcome screen.

Reported-by: hlong290494 and bnurbekov
Singed-off by: Long Nguyen Duc Hoang <lhnguyenduc@wpi.edu> and Batyr Nurbekov <bnurbekov@wpi.edu>
Updated RegEx string to cover more case.

Reported-by: hlong290494 & bnurbekov
SIgned-off by:
Long Nguyen Duc <lhnguyenduc@wpi.edu>
Batyrlan Nurbekov <bnurbekov@wpi.edu>
Merge pull request #280 from hlong290494/emailValid

Email valididation regex update