Implementing host delete
Implementing read host var
Implementing host var update
Implementing delete var
Removing some unnecessary error handling
Correcting uses of QueryRowx per feedback

plus fixing a logic goof around UpdateHost
Implementing query string filtering of all inventory

by hostname prefix, team, and env
Adding team and env filtering to the inventory script
A few more changes per feedback related to sqlx usage
Making the inventory help text a bit more handy
Implementing read, update, and delete of host tags

through some really evil copy pasta and a smidge of editing :scream_cat:
Drying up the vars and tags code

plus removal of old/empty files.
Missed a vars/tags handling branch
Making sure hstore types are merged during update

rather than overwritten.  This is mostly so that syncs from external
sources such as joyent don't clobber any custom tags or vars set
directly through the tory API.
A bit of renaming to feel less icky about the vars/tags situation
Merge pull request #11 from modcloth/more-server-actions

More server actions