update to current version of guard (1.3.0)

also added simplecov to test environment for ruby 1.9
add spec for template and sample guardfile
restrict simplecov to ruby 1.9s that have it!

Turns out that some ruby 1.9s don't have simplecov, doh!
Merge pull request #5 from hilary/update_to_guard_1_3

Update to guard 1 3
bumps version to 0.1.5
adds support for notifications
bumps version to 0.1.6
removes pointless UI message
updates guard so it can support up the most recent version
updates to version 0.1.7
adds the gem badge