Fixing golint warnings

* Moving final return outside of if-else
* Removing type declarations that Go can infer from values
* Cleaning up some existing comments
* Changing snake_case variables to camelCase

bash_completions_test.go

@@ -25,7 +25,7 @@ func check(t *testing.T, found, expected string) {
 
 // World worst custom function, just keep telling you to enter hello!
 const (
-	bash_completion_func = `__custom_func() {
+	bashCompletionFunc = `__custom_func() {
 COMPREPLY=( "hello" )
 }
 `
@@ -37,7 +37,7 @@ func TestBashCompletions(t *testing.T) {
 	c.AddCommand(cmdEcho, cmdPrint, cmdDeprecated, cmdColon)
 
 	// custom completion function
-	c.BashCompletionFunction = bash_completion_func
+	c.BashCompletionFunction = bashCompletionFunc
 
 	// required flag
 	c.MarkFlagRequired("introot")