fix go vet issues
simplify for range loop
Rename printUsage() -> PrintUsage()

Also rename printUsageTo() -> PrintUsageTo()
print short usage on usage errors
improve error msg on scale w/ duplicate dyno type

Fixes #133.
Example -> Examples
cleanly handle nil user in psql
update speakeasy again to avoid reading extra input accidentally
another speakeasy update
document ability to use git remote in -a flag
git remote host from gitconfig

Find a Heroku app remote with a custom hostname from a `heroku.host`
gitconfig. The git host gets picked in this order of preference:

* `HEROKU_GIT_HOST`
* `HEROKU_HOST`
* `heroku.host` in gitconfig
* `heroku.com`
Revert "git remote host from gitconfig"

This reverts commit 3b3667c9cfdfc99f05f8a8fb291f6d3c545c1584.
fix releases flag, thanks @deafbybeheading
update to latest heroku-go
allow bypassing ssl cert preprocessing
respect default org setting on app create
allow user to specify an org on app creation
handle 'personal' org correctly on app create
tell the user which org we created an app in
don't need to lookup orgs list if flag is specified