fix(timepicker): Add CSS for IE10 flexbox
fix(timepicker): Add CSS for IE10 flexbox

Fixes #2163 
Closes #2167 
jnizet/ng-bootstrap,benouat/ng-bootstrap,maxokorokov/core,ng-bootstrap/ng-bootstrap,pkozlowski-opensource/core,maxokorokov/core,fbasso/ng-bootstrap,pkozlowski-opensource/core,ktriek/ng-bootstrap,jnizet/ng-bootstrap,benouat/ng-bootstrap,benouat/ng-bootstrap,Foxandxss/ng-bootstrap,ng-bootstrap/core,maxokorokov/core,Foxandxss/ng-bootstrap,benouat/ng-bootstrap,jnizet/ng-bootstrap,ng-bootstrap/ng-bootstrap,fbasso/ng-bootstrap,ktriek/ng-bootstrap,jnizet/ng-bootstrap,ktriek/ng-bootstrap,fbasso/ng-bootstrap,maxokorokov/core,Foxandxss/ng-bootstrap,ktriek/ng-bootstrap,pkozlowski-opensource/core,ng-bootstrap/core,ng-bootstrap/ng-bootstrap,ng-bootstrap/ng-bootstrap,ng-bootstrap/core,fbasso/ng-bootstrap