Examples json and combined.js files in build dir
Remove unneeded test in build.py
Move Plovr json files in specific dir
Tests requireall.js generated in build dir
.gitignore clean-up
Move hosted examples loader our of build dir

The build dir is now empty, and therefore unexisting for Git.
Git can now ignore the entire build dir
Merge pull request #446 from elemoine/build

Put all build artifacts in a single directory