shim getSignatureAtPosition using the new signature help interfaces
remove empty lines
respond to code review comments
Merge branch 'master' into singatureInfo

Conflicts:
	src/services/services.ts
	src/services/shims.ts
set applicaple span correctelly
enusre that child items is always set
Merge pull request #745 from Microsoft/singatureInfo

Shim getSignatureAtPosition using the new signature help interfaces