perf: use call and === instead of apply and == in type check functions
perf: use call and === instead of apply and == in type check functions

Updates isDate et al to use call instead of apply and === instead of ==.
The change to call brings minor performance improvement and === is just
better practice than ==.
http://jsperf.com/call-vs-apply-tostring

Closes #5295

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js