add ERB option which clears whitespace

 and remove instance tag creation (now accomplished with model)
switch to using '-' for trim_mode, and add comments to that affect
Merge pull request #8 from madAndroid/remove_tag_creation_and_erb_whitespace_clear

Remove tag creation and erb whitespace clear
Added wait_until_ready to reduce flakiness
Merge pull request #9 from mikesilky/master

Added wait_until_ready to network interface creation to reduce flakiness
merge upstream changes