Fix formatting in README [ci skip]
Merge pull request #1 from jcoyne/patch-1

Fix formatting in README [ci skip]
Use Dir.chdir with a block instead of FileUtils.chdir
generate a line in the .gitignore file to ignore the generated test app. Fixed #2
add section stubs to readme
use a rails generator to set up the host gem
quiet the check-ignore check.
get the tests working against a generated test engine
bump to 0.1.0
Allow setting an environment variable for CURRENT_ENGINE_NAME.

This enables blacklight to build with blacklight-bootstrap3 and
blacklight-bootstrap2 as the gem that gets included in Gemspec.