ADN Editorial.  Gov. Sean Parnell (NGP Stock Photo) has for the last few years counseled patience on the gas line development headed by TransCanada. Apparently his patience is running out. The governor now says he'd like to see the major North Slope producers -- Exxon Mobil, BP Alaska and Conoco Phillips -- join in a project to pipe Alaska's gas to Valdez, where it would be liquefied and shipped in tankers to Asian customers. ADN by Becky Bohrer.  Gov. Sean Parnell is making his first state-sponsored trip overseas, meeting with [...]