upgrade web image to xenial

[CircleCode]

Here is an attemps to use xenial version (following #24). Here are the changes from the current image:

• add environment variables:
  • LEMUR_VERSION (defaults to master): branch or tag to fetch and install
  • LEMUR_TARGET (defaults to develop): makefile target to build
• no more using external repositories for
  • nodejs
  • python 3
• use /usr/local/src/lemur as default workdir

But it seems once successfully builded, the application does not run corectly, even when master is builded.

So I suppose there must be a review in case this is linked to this dockerfile. (especially ping @kevgliss since even when building master, it seems to still be affected by netflix/lemur#996)

I should also update Readme to explain variables.

[kevgliss]

When is the last time you've run? netflix/lemur#996 should now be fixed in master. Are there additional errors?

[CircleCode]

I've checked it against current master (commit ad88637f22c2e8418db3f96ba473c5f11d421e22) Running with latest firefox nightly, i get the following errors in the js console:

ReferenceError: require is not defined[En savoir plus] vendor.js:80273:1

Error: [$injector:modulerr] Failed to instantiate module lemur due to:
[$injector:modulerr] Failed to instantiate module chart.js due to:
[$injector:nomod] Module 'chart.js' is not available! You either misspelled the module name or forgot to load it. If registering a module ensure that you specify the dependencies as the second argument.
http://errors.angularjs.org/1.4.9/$injector/nomod?p0=chart.js
minErr/<@https://localhost/scripts/vendor.js:17042:12
module/<@https://localhost/scripts/vendor.js:18980:17
ensure@https://localhost/scripts/vendor.js:18904:38
module@https://localhost/scripts/vendor.js:18978:14
loadModules/<@https://localhost/scripts/vendor.js:21421:22
forEach@https://localhost/scripts/vendor.js:17315:11
loadModules@https://localhost/scripts/vendor.js:21405:5
loadModules/<@https://localhost/scripts/vendor.js:21422:40
forEach@https://localhost/scripts/vendor.js:17315:11
loadModules@https://localhost/scripts/vendor.js:21405:5
createInjector@https://localhost/scripts/vendor.j… vendor.js:29696:18

additionnaly, in the header, {{ currentUser.username }} {{ currentUser.username }} is not replaced.

[kevgliss]

I'm not sure what to make of this. I've pulled your PR and run docker-compose up and was able to login just fine. Are you sure you aren't cached somewhere? I would try docker-compose build lemur-web. Regardless this looks excellent and am happy to merge.

[kevgliss]

Closes #22 and #24

[CircleCode]

it seems i effectively had some cache somewhere, but I really does not know where… dropping all containers and images, and restarting from scratch solved my issues.