Remove reference to lib.es6.d.ts from lib-tsd.d.ts
Remove reference to lib.es6.d.ts from lib-tsd.d.ts

lib.es6.d.ts is already included in tsconfig.json so the reference is
redundant. Furthermore lib-tsd.d.ts is generated by the tsd tool, and
should only reference the typings pulled in by the tsd tool.

enlight/dbgmits,enlight/dbgmits,enlight/dbgmits,enlight/dbgmits