Upgraded underscore to v1.5.2
Fixed merge problem in underscore.d.ts
make mocha signatures --noImplicitAny friendly
make sinon signatures --noImplicitAny friendly
Merge pull request #1068 from jbaldwin/master

Upgraded underscore to v1.5.2
Merge pull request #1070 from varju/no-implicit-any

noImplicitAny support for mocha and sinon