code style can be better

[GoogleCodeExporter]

1. use `go fmt` 
2. use dot imports may conflict with other names defined in the program
3. "for i, _ := range y {" can be replaced with "for i := range y {"
4. "var fZero float64 = float64(0.0)" -> "var fZero = float64(0.0)"
5. "var x float64 = 0" -> "var x float64"
6. don't use underscores in Go names
7. don't use ALL_CAPS in Go names; use CamelCase

Original issue reported on code.google.com by [email protected] on 5 Nov 2013 at 12:35