According to Jira Project keys must start with an uppercase letter, followed by one or more uppercase alphanumeric characters

Summary: Jira allows creating projects which contain number in names, phabricator will not allow such projects but it should

Test Plan: Pasted URL with Jira project which contain number in project name and it was parsed and resolved properly in phabricator

Reviewers: epriestley, Pawka, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D21040