Spell checker

[nebbles]

Support for spell checking

[nebbles]

Call to git commit will open in the default text editor. When the file is saved and closed the commit then automatically gets processed.

This could be used by the script to do its own version of creating a temporary file for the editor to open and act on, followed by finishing the commit once the editor saves and closes.

This behaviour might be desirable as a command line flag rather than default, or the reverse. Either way it should probably be toggle-able.

[nebbles]

This is dependent on #18 as the message would need to be checked for format validity after it's been manually edited in an external editor.