Fix detecting TypeScript default lib files#48

Merged

timocov merged 3 commits intomasterfrom

fix_detect_ts_lib_files

Jun 29, 2018

Commits on Jun 27, 2018

Increase minimal supported TypeScript version to 2.6.1
timocov
committed
Use Program.isSourceFileDefaultLibrary to detect whether file is default library
timocov
committed
Add support to compile and test code with different versions of TypeScript
timocov
committed