example(bootstrap): add additional components
feat(templateFinder): now takes an array of templateFolders
fix(doc-renderer): renderer now expects an array of templateFolders
fix(template-finder): finder should return relative path to template

Nunjucks doesn't like absolute paths to templates so we must return
relative paths and let nunjucks work out which templateFolder it came
from
fix(doc-renderer): pass an array of templateFolders to nunjucks

`nunjucks.config()` doesn't accept an array, so we had to use the more
explicit `new nunjucks.Environment()` form of configuration.
refact(angularjs package): move example specific templates out of package