Upgrade to TypeScript 0.9.5
Avoid duplicate definition warnings when using relative paths in <reference/>s
Update plugin code to support:
- using a single output file
- setting the target ECMAScript version
- automatic fallback to internal TypeScript compiler when 'tsc' is not on the path
Merge pull request #7 from gertv/master

Upgrade to TypeScript 0.9.5 and support for single output file