Simplify curl on initial download
Bugfix for bash 4

Before this fix, a user that was not authy-ssh enabled trying to git push would receive the following error.

    /usr/local/bin/authy-ssh: line 428: [: git-receive-pack: unary operator expected
Prevent symlink race issues when updating the plugin.

This is done by randomizing the temp file using the command `mktemp`
Thanks to R.I.Pienaar for reporting this issue.
Merge remote-tracking branch 'orchdork10159/master' into next-release
Merge remote-tracking branch 'mobilemind/master' into next-release
Merge remote-tracking branch 'simmel/patch-1' into next-release
Fix some typos in the tests.

The tests were failing because the typo was fixed previously in the code
but the tests weren't updated.
Fixed typo.
Don't require root to install.
Merge remote-tracking branch 'dmuth/master' into next-release
Fix shebang line for uncommon bash installations.

Fixes #14
Fix test when installing as normal user.
Bump version.
Ensure that the target directory exists, with error checking turned on.
Add test to check the installation on new directories.

Also fixed the indentation.
Add instructions for mosh

Since mosh is using ssh for authentication non-interactively we have to
use the AUTH_TOKEN environment variable.
Trim trailing whitespace
Fix markdown formatting.
Merge branch 'trim_trailing_whitespace' of https://github.com/simmel/authy-ssh

Conflicts:
	README.md
Improve a little the markdown formatting.

Also, corrected a couple of typos.