Dogwood upgrade automation

Upgrading to Dogwood is complicated, because we have to make two
intermediate stops along the way: once at the end of Django 1.4 to
migrate the databases using South, then to the beginning of Django 1.8
to apply --fake-initial migrations.  Then we can upgrade to the Dogwood
release that we actually want.

Use the ubuntu keyserver

Remove spaces around '=' in New Relic config ini file.

Add Elasticsearch overrides to Course Discovery for production and do…

Enable other possible attribute to forward New Relic browser attributes.

Mongo 3.0.8 includes a fix for data loss

OPS-1208 Refactor Nginx SSL redirect bahavior

use the second if with NGINX_SET_X_FORWARDED_HEADERS

introduce new variable NGINX_REDIRECT_TO_HTTPS for redirect

simplify the logic

fixed the typo

change the if statement logic

nginx error fix

apply the last fixed to all the required templates

Auto confirm for gcc/g++ ppa

`sandbox.sh` hang at the step when it add the gcc/g++ ppa for user respone(yes/enter), you make it better to make it auto install without user interaction. Thanks

fix the shell if syntax

fix the shell if syntax

Revert "Auto confirm for gcc/g++ ppa"

Rebuild node-sass before compiling Sass

https://groups.google.com/forum/#!topic/mongodb-announce/mBesDEtR5l0

Additionally, it includes the fix for TOOLS-939 so we should not need to
pin to 3.0.6 any more.

updating refs, use external script

Don't need to sync folders when building the base box.

Compile Programs Sass prior to running r.js and cache static assets

Allows r.js to minify CSS hosted by the Programs service. This in turn yields minified files with unhashed names we can use to fetch these assets from Studio. Nginx now allows these assets to be held in public caches for an hour. ECOM-2862.

Don't mount directories we aren't going to use.

Add our PPA in bootstrap script

Send front-end PageView custom metrics to New Relic Insights.