Cleard parser.body when non-declaration statement.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Added logging goGet, goImports.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Moved goImports, goGet to shell.go.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>