Some clarifications on Contributing
Use secure protocol for Gemfile
Ignoring tmp folder
Replace magic values with constants

From @mbj's feedback
Set durable rspec options
Gitignore /tmp and ignore repo relative root

Conflicts:
	.gitignore
Remove yard group from Guardfile for lower dev cycle latency
Do not include acceptance specs in dev cycle

Acceptance specs should only be run on ci or debugging. Will reactivate
them later via ENV variable or something.
Replace unneded block capture with yield
Use reflective codeclimate badge
Bump version in development branches, closes #30