closes#6505
-Removed all of the /*jshint expr:true*/ comments from the tests
-Removed all of the should.equal(true, true) statements from the tests
-Removed should from the greenkeeper ignores
close#2757, refs #5286
- moves error formatting from api/index into errors lib
- moves error handling from api/index into its own middleware
- adds extra middleware for method not allowed which captures all unsupported routes