Remove one pod (#76)

Remove one pod (#76)

* Client: Fix typo

* Client: Add removeFriend feature

* Server: Add removeFriend feature

* Server: Update method name

* Fix rebase onto develop issues

* Server: Fix error message

* Server: Remove useless methods in removeFriend method

* Server: Finish remove on pod feature after rebase

* Server: Type pod parameter

* Fix Travis build

* Add friend-basic test for the remove one pod feature

* Add check-params tests for the remove one pod feature

* Fix typos

* Add friend-advanced test for the remove one pod feature

* Client: Trailing new line

* Move to promises

* Add undefined id test

* Use find method instead of a for loop to find the friend to remove

* Remove setTimeout method

* Server: Remove requestScheduler operations

* Server: Fix logging messages

* Server: Remove sign request parameter