Resolves performance issue by removing invalid config

[garethflowers]

Setting files and includes to empty arrays creates an invalid tsconfig.json file - and seems to subsequently cause performance issues.

This PR will remove the properties altogether.

Fixes #754.

[coveralls]

Coverage increased (+0.5%) to 86.216% when pulling 07bdb16 on garethflowers:master into 544851e on TypeStrong:master.

[coveralls]

Coverage increased (+0.5%) to 86.216% when pulling 07bdb16 on garethflowers:master into 544851e on TypeStrong:master.

[blakeembrey]

@garethflowers I'll take a look. My concern with deleting the files means that TypeScript actually resolves every file in the directory, breaking what this was originally added to solve.

[blakeembrey]

Confirmed, it breaks file loading and fixes perf by preloading every file in the current directory. I can't accept this PR as-is. We should try to find the root cause here.

[blakeembrey]

I just noticed this did not work correctly with include, typo'd as includes. I'll release a version with this but if it is related to files I'm not sure this will fix things for you. Best course of action would be finding a project large enough I can replicate the issues on.

[blakeembrey]

I don't think it's e009d79, but please try it out and let me know if the latest patch improves things!