Check pickmes against added requests

Check pickmes against added requests and edited added requests against other
added requests, but don't flag an added request if a pickme conflicts against it
Skip pickmes that have not been checked against master
Merge pull request #104 from rschlaikjer/test-pickmes-against-added

Improve pickme conflict detection logic

* Check pickmes against added requests
* Editted pickmes only check against other added pickmes
* Added pickme's do not gain conflict tags when compared against non-added pickmes
* Skip conflict-master pickmes
* Skip unchecked pickmes. Those pickme's will be checked later.