Gracefully handle TERM signals (GoogleCloudPlatform#206)

Add a -term_timeout flag, when receiving the TERM singal proxy will wait up to `term_timeout` for existing connections to close.

Set default value for IP preferences to be public then private. (Goog…

…leCloudPlatform#208)

If an instance has no public IP and a private IP, the proxy client will then attempt to connect to the private IP.

Manually merge GoogleCloudPlatform#121 back due to refactor in Google…

…CloudPlatform#105

Merge pull request GoogleCloudPlatform#104 from Carrotman42/master

Set the UserAgent used when contacting the sqladmin API

Merge pull request GoogleCloudPlatform#77 from apelisse/use-alpine-ba…

…se-docker

Use alpine docker base image to get certificates

Merge pull request GoogleCloudPlatform#68 from Carrotman42/master

Fix panic when the region is omitted

Merge pull request GoogleCloudPlatform#66 from ankushagarwal/master

Bug fix: Create the directory first and then check using os.IsNotExist

Merge pull request GoogleCloudPlatform#51 from SamiHiltunen/typo-fix

fix typo in refreshCfg

Merge pull request GoogleCloudPlatform#29 from Carrotman42/dockerfile

Add support for building a docker container in build.sh