feat(webapi): saveScreenshotToPath

Author: kobenguyent

.gitignore

@@ -10,6 +10,7 @@ website
 .idea
 docs/build
 test/data/output
+test/data/custom
 test/acceptance/output
 test/bdd/output
 examples/output
@@ -26,4 +27,4 @@ package-lock.json
 yarn.lock
 /.vs
 typings/types.d.ts
-typings/promiseBasedTypes.d.ts
+typings/promiseBasedTypes.d.ts