Added function to get startup and shutdown scripts
Adds startup and shutdown scripts to run directory

Fixed bugs
Separated out script fetching logic

Created a file for fetching a metadata script
Removed dead code and made style consistency
Fixed a script name typo
Fixed typo
Separated out script fetching logic

Created a file for fetching a metadata script
Removed dead code and made style consistency
Merge branch 'master' of https://github.com/illfelder/compute-image-packages
Added logic to run the shutdown scripts

Shutdown script works on Debian 7
Change to make shutdown script work with upstart
Enabled shutdown scripts on systemd

Service performs both startup and shutdown scripts
Writes serial port output
Added a preset script for systemd startup/shutdown
Renamed google-scripts.service to original name
Shutdown script can be specified in metadata

Added the metadata flag shutdown-script in addition to
shutdown-script-url.
Added disclaimer messages.
Removed onboot fetch of shutdown script.
Added quotes around variables in case of spaces.
Merge remote-tracking branch 'upstream/master'
Code review changes
Version bump for new compute image packages
Merge pull request #111 from illfelder/master

Implemented shutdown scripts for all supported instances