Handle "extends"#27

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Zerogiven wants to merge 3 commits intoTypeStrong:masterfrom

Zerogiven:patch-1

Commits on Jan 5, 2018

Remove not necessary filename param from parse method
CSoellinger
committed
Extend tsconfig if "extends" property is present
CSoellinger
committed
Remove async and await from readFile and using now readFileSync for extending. This is needed cause code coverage is collected from the compiled JS files and not from the TS ones.
CSoellinger
committed