chore(travis): fix browser provider config (#154)
chore(travis): fix browser provider config (#154)

Fix tests for SauceLabs and BrowerStack testing:

fix SauceLabs to test IE 11 on Windows 10
disable failing Safari 10 testing (MacOS Sierra)
d3viant0ne/flex-layout,karlhaas/flex-layout,atscott/flex-layout,karlhaas/flex-layout,karlhaas/flex-layout,atscott/flex-layout,d3viant0ne/flex-layout,angular/flex-layout,DevVersion/flex-layout,benbraou/flex-layout,brendanoffer/flex-layout,benbraou/flex-layout,angular/flex-layout,DevVersion/flex-layout,DevVersion/flex-layout,benbraou/flex-layout,atscott/flex-layout,atscott/flex-layout,d3viant0ne/flex-layout,angular/flex-layout,benbraou/flex-layout,brendanoffer/flex-layout,angular/flex-layout,brendanoffer/flex-layout