Omit ext.appengine from test coverage
Omit ext.appengine from test coverage

subyraman/wtforms,Aaron1992/wtforms,hsum/wtforms,crast/wtforms,pawl/wtforms,cklein/wtforms,pawl/wtforms,Xender/wtforms,jmagnusson/wtforms,Aaron1992/wtforms,wtforms/wtforms,skytreader/wtforms