Small fix needed for align_indentation command

[fredcallaway]

First off, great plugin; thanks!

Secondly, I couldn't get the align_indentation command to work as given (syntax error at line 64):

Traceback (most recent call last):
  File "/Applications/Sublime Text.app/Contents/MacOS/sublime_plugin.py", line 556, in run_
    return self.run(edit)
  File "/Users/fred/Library/Application Support/Sublime Text 3/Packages/SelectionTools/SelectionTools.py", line 65, in run
    edit = self.view.begin_edit()
TypeError: begin_edit() missing 2 required positional arguments: 'edit_token' and 'cmd'

I looked into it and it doesn't seem like commands should need to create their own edits (they receive an edit through the argument to run(), so I just deleted that line, and line 67 along with it. Now it works great!