fix spec failing when run in random order + when running 1 test
remove VERSIOn file
Merge pull request #765 from zendesk/grosser/version

Move version designation into lib/mail/version.rb itself rather than using an external VERSION file. Simpler, less code, and nothing depends on the externals VERSION file.
refactor address list
support windows-1258
prevent any future encoding errors
Merge pull request #746 from zendesk/grosser/random

fix spec failing when run in random order + when running 1 test
Merge pull request #768 from zendesk/grosser/encoding

prevent any future encoding errors
Merge pull request #764 from zendesk/grosser/ref-add

refactor address list
use encoding constants
parse non-ascci filenames
Loosen Travis-CI ruby versions; fix 1.9.2 not installable
Merge pull request #767 from zendesk/grosser/Windows1258

support windows-1258
Merge pull request #769 from zendesk/grosser/encoding

Prefer encoding constants to strings: `Encoding::UTF_8` vs `'utf-8'`
Merge pull request #770 from bf4/ruby192

Loosen Travis-CI ruby versions; fix 1.9.2 not installable
Merge pull request #762 from zendesk/grosser/content-utf8

parse non-ascci filenames
clean trailing whitespaces