Fixed the 'unassigned' variables bug

This fixes a few issues I had, when trying to run your additional code. :)

```
Traceback (most recent call last):
  File "./sublime_plugin.py", line 362, in run_
  File "./Alignment.py", line 217, in run
  File "./Alignment.py", line 128, in align_lines
UnboundLocalError: local variable 'points' referenced before assignment

-----------------------------------------------------

Traceback (most recent call last):
  File "./sublime_plugin.py", line 362, in run_
  File "./Alignment.py", line 217, in run
  File "./Alignment.py", line 129, in align_lines
UnboundLocalError: local variable 'max_col' referenced before assignment
```