Update README, add travis badge.

(cherry picked from commit 10954672ed4e05a3a563b60a38fc158d59a063ed)
Signed-off-by: Andy O'Neill <andy@potatoriot.com>
Heaps of documentation.

(cherry picked from commit c47d3e0f819d6cc18125e13be3a60bb6cb2963c1)
Signed-off-by: Andy O'Neill <andy@potatoriot.com>
Add switches to disable pipeline and add config to README

(cherry picked from commit c729f84cbcb9a4d54a084f52a17bcf27bbbb4195)
Signed-off-by: Andy O'Neill <andy@potatoriot.com>

Conflicts:
	lib/rails-pipeline/subscriber.rb