Add support for DSA SSH private keys
Support Python 2.7.9 strict SSL hostname checking
Do not allocate a TTY when building

Using parallel + a Docker tty seems to work only erraticaly.

We want the output, but we don't need to be able to write, so disabling
tty is fine.
Improve Docker build scripts

+ Do not allocate a tty in Docker run. We don't need one, and if we're
  running under parallel, we may not be able to allocate one.
+ Use gosu instead of sudo. CentOS has Requiretty enabled for sudo, so
  it's just easier to use that.
Comply with setuptools 8

Setuptools 8 ships with a new package naming convention, and renames
packages that don't comply to its own package convention.

We ensure our Python package version complies with setuptools' policy.

See: http://python.org/dev/peps/pep-0440/#public-version-identifiers
Support the two versioning schemes

The installer package files still retain the non-Python versioning
scheme, so we can no longer use the scalr-manage package's version to
guess the corresponding installer version.
Fix several bugs in version checking

  + Only "." is an acceptable separator between special and index (used
  to allow anything).
  + Index and special *require* their separator
Release: 7.8.1
Merge pull request #96 from Scalr/release-7.8.1

Release 7.8.1