mail instead of tmail in mailexceptions

[bratke]

Hi,

I migrated mailexceptions to require mail instead of tmail.
2 reasons:

• tmail just did not seem to work on my setup (ruby 1.9.2, sinatra, 64-bit arch)
• Mikel Lindsaar suggests this replacement (http://tmail.rubyforge.org/)
  I also fixed one failing test.

what i didn't:

• gemspec is untouched

Regards,
L. Bratke

[ioquatix]

This seems like a great patch... why hasn't it been integrated?

[rkh]

Because rack-contrib is currently not maintained.

[ioquatix]

Okay so do you need a maintainer?

[rkh]

I guess so. You should talk to @rtomayko if you are interested.

[ioquatix]

Okay, great, thanks @rkh.

@rtomayko I'm talking to you now it seems 🚁

[rkh]

If you rebase, I will merge.

[mpalmer]

Closing this PR in favour of #65, which appears to be a superset of this one.