Update and rename Readme.md to README.md
Fixed some minor things and renamed the file to be more standard.
Commit from felixphew.
added transifex info + better link to project page

added link to transifex to prevent users from sending pull requests for localizations via github
[FIX] Terminate Mail before update. [#751 state:fixed]
RegexKit signed.
Sparkle with prefixes.

[#752 state:fixed assigned:mento]
[FIX] error msg

GPGMail may doesn’t work as expected.
-> GPGMail is not working as expected.
[FIX] allow more width in Preferences Window

[FIX] more width in GPGMail preferences window for localization strings
and „Check Now“ Button
[FIX] Restore sign and encrypt status when a editing of a draft is continued [#760 state:fixed] [#692 state:fixed]

- Already decides whether or not to encrypt a draft in [ComposeBackEnd makeMessageWithContents:isDraft:shouldSign:shouldEncrypt:shouldSkipSignature:shouldBePlainText:]
- Saves the current sign and encrpyt status as messages headers, in order to restore them later.
Merge branch 'dev' of https://github.com/GPGTools/GPGMail into dev
[FIX] Record sign and encrypt status even if not explicitly changed by the user [#761 state:fixed]
[FIX] Remove duplicate headers added by MailTags when saving a draft [#747 state:fixed]

- This only seems to occur if the message is to be encrypted and saved as a draft
  so the duplicated headers are only removed in that case.
[FIX] Keep signing information non non-drafts and properly sign the message upon sending [#762 state:fixed]
huge cleanup of error messages

improved many error messages
fixed http https confusion for website / support site
[#652 state:fixed assigned:steve milestone:2.1.1]
Merge branch 'dev' into japanese-translation