Add possibility to indicate explicitly tsconfig location

[procopenco]

Summary

• I have added possibility to indicate location of tsconfig.json. It is same syntax as for ts-node. I think it will be very helpful.

Example

> ts-node -r ./register.js --project ./example/project/tsconfig.json ./example/project/main.ts
or with alias
> ts-node -r ./register.js -P ./example/project/tsconfig.json ./example/project/main.ts

[coveralls]

Coverage decreased (-0.2%) to 83.727% when pulling 9039622 on procopenco:add-possibility-to-indicate-tsconfig-location into 215b423 on dividab:master.

[coveralls]

Coverage increased (+1.7%) to 85.668% when pulling 9b4f3ff on procopenco:add-possibility-to-indicate-tsconfig-location into 215b423 on dividab:master.

[procopenco]

@amodm @jonaskello
Hey guys, please take a look. This feature will help me a lot.

[jonaskello]

Looks good to me!

@Jontem would you care to take a look too?

@procopenco Perhaps you can also add some docs about this option to the readme?

[procopenco]

@jonaskello Added docs to readme. Please take another look.

[jonaskello]

Released in 3.3.0