Use c sort order

To match the existing domains file.
Can be done with :sort in vim.
Default domains.txt target for add-new script
Remove generated gmail xml

Can be regenerated at will so shouldn't be in source control.
Has got out of sync.
Added ignore to prevent re-adding.
Removed irrelevant .gitignore entries.
Removed call from addnew as is separate concern (not everyone uses gmail)
Don't push automatically

That should always be a human decision, publishing stuff
Tidied up domain console output

Show result of split
Clearer usage info

I didn't realise you could use email till I read the code.
Lowercase all domains

This will make sorting consistent.
Domains aren't case sensitive.
Re-sort list
Add code-soup.com
Add talentspa.co.uk
Add sjit.co.uk
Add nexere.com
Add ventula.co.uk
Add kdrrecruitment.com
Merge pull request #8 from timabell/master

Script cleanup + domains added & sorted