Run goimports

Separated stdlib imports from other imports.
t.Fatalf(err.Error()) -> t.Fatal(err)
Fix nil panic in postgresql/result.go

SQL errors from CursorQuery() were unhandled in Next(). Caused nil panic when using Collection.One and db.Cond was invalid. Fixed by handling errors.
Merge pull request #20 from maxhawkins/panic

Fix nil panic in postgresql/result.go
Merge pull request #19 from maxhawkins/lint

Small Formatting Fixes
Running goimports again and changing style of Fatalf(err.Error()) on remaining files.
Resolving conflicts from master branch.