Prevent any transforms or other code in grunt-ts from entering the node_modules folder

[nexussays]

see: #105

[nycdotnet]

This bit me today. I will try to fix this soon.

I intend to add an override option to allow it, though. Perhaps allow_node_modules, or something, which will default to false.

[basarat]

any transforms or other code in grunt-ts from entering the node_modules folder

Yeah sound like a good sane default (even without the override).

[basarat]

TIP : look for the point where we do grunt.file.expand and concat : ['!**/node_modules/**'] if array or make it an array and then concat