Fix spelling errors in comments.

Fix Gravatar images in web view (like commit listing)

Added issue link rendering in commit messages

Related to #700

In the original bug report it was referencing only the sytem avatar images for setup users (like in the header); however the problem also persists with things like commit history.

This commit fixes the `tool.AvatarLink` function so that it also uses the already existing `avatar.HashEmail` function.

I also refactored the `tool.AvatarLink` method some to make the control flow more apparent and adhere better to DRY (there were multiple calls to the `EncodeMd5` function that the `HashEmail` function call replaced, now there is only one.)

According to the [Gravatar API](https://en.gravatar.com/site/implement/hash/) whitespace should also be removed from the email, it was not doing this previously.

Display multi-line commit message on commit diff page.

Use the avatar.HashEmail function instead of hashing email directly.

add full name to found users' list on the UI

update user api search results to include the full name

fixed code view line height for firefox

Is fully backwards compatible
Fixes #677

Addded sha1 pattern in markdown for current repository

Cert command stub should return a non-zero exit code

Fix swapped issue/star columns in /admin/repos

Fix user links

Added comments documenting how to export SSL keys from .pfx