MUMUP-1151 : Move to a maven based project

* Restructured project to be a maven project (basically moved everything to `/src/main/webapp`)
* Removed `angular.css` from project
* Added in `lesscss` compile to maven build
* Added in tomcat deployer to project (see README.md for setup)

Also created a new build for this: https://my-tools.doit.wisc.edu/jenkins/view/my-predev4/job/my-predev4-deploy-angular-maven/