pynxc doesn't check for type of variable

/tmp/tmpCZPiU_/<name_of_program>.nxc
python:

``` python
def main():
    a1="X"
    TextOut(10, LCD_LINE1, a1)
```

nxc:

``` nxc
task main()  {
    int a1;
    a1 = "X";
    TextOut(10, LCD_LINE1, a1);
}
```
