Use path for extension

[kesselb]

Description:

Read extension of filename with path lib.

Improvements

• Use Path-Lib for reading filename extension
• Increase code coverage for media controller
• Dont use .istanbul.yml as test file
• Test case when no extension present

[coveralls]

Pull Request Test Coverage Report for Build 2538

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 67.141%

---

Totals
Change from base Build 2535:	0.2%
Covered Lines:	1238
Relevant Lines:	1773

---

💛 - Coveralls