Revert "fixed PHP notices and formatting"

This reverts commit 8f4c2cecf5d06406eb2a104b50c20d70e574e6d1.
Revert "used const instead of hardcoded string"

This reverts commit 70149cc16abf13e597e84ff543132ec3ccd85d18.
Revert "added change in MW Http class to return MWHttpRequest instance when a returnInstnace option is passed"

This reverts commit 2eaeeaf1d0dfdad81890cef0130e790bdb1f7609.
Revert "added EXAMPLE_URL constant and failing unit test"

This reverts commit fd3e02919531bca577256f65cd0a596f0a93fa7b.
Revert "new unit tests for Http class"

This reverts commit bea9275d7c053d1d185963331e753d1dfb2cb62f.