Bumping version to 0.1.0

Bumping minor version to differentiate this gem from the older stacker
gem hosted on rubygem.
Merge pull request #15 from cotap/version-upgrade

Bumping version to 0.1.0
Rename ambiguous #time method to #formatted_time

Signed-off-by: Evan Owen <kainosnoema@gmail.com>
Enforce non-destructive update policy by default, requiring override

It's a little too easy to accidentally replace or destroy a resource
unintentionally, simply by changing a parameter of an existing stack.
This change ensures that you're at least aware of the risks before
moving forward with a potentially risky update.

Signed-off-by: Evan Owen <kainosnoema@gmail.com>