Update ExternalIssue regex for JIRA integration
The pattern in the `::reference_pattern` class method in the ExternalIssue model does not match all valid forms of JIRA project names. I have updated the regex to match JIRA project names with numbers and underscores. More information on valid JIRA project names can be found here: https://confluence.atlassian.com/jira/changing-the-project-key-format-192534.html * The first character must be a letter, * All letters used in the project key must be from the Modern Roman Alphabet and upper case, and * Only letters, numbers or the underscore character can be used.
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