[spec] Update rake tasks (refs: #372)

Update the default task to clean fixtures, and don't run coverage report
(asked by @EmilienM).

New tasks:
  rake           => run all tests and clean fixtures (alias on :test)
  rake test      => run all tests and clean fixtures
  rake test_keep => run all tests and don't clean fixtures
  COV=y rake cov => run all tests, run coverage repo, and don't clean fixtures

Refs: #372

README.md

@@ -106,7 +106,7 @@ Limitations
 Getting Involved
 ----------------
 
-Need a feature? Found a bug? Let me know!
+Need a feature? Found a bug? Let us know!
 
 We are extremely interested in growing a community of OpenStack experts and users around these modules so they can serve as an example of consolidated best practices of how to deploy openstack.
 

Rakefile

@@ -17,7 +17,15 @@ PuppetSyntax.exclude_paths = exclude_paths
 
 
 task(:default).clear
-task :default => [:spec_prep, :spec_standalone, :lint]
+task :default => :test
 
 desc 'Run syntax, lint and spec tests'
 task :test => [:syntax,:lint,:spec]
+
+desc 'Run syntax, lint and spec tests (without fixture purge = train/airplane)'
+task :test_keep => [:syntax,:lint,:spec_prep,:spec_standalone]
+
+if ENV['COV']
+  desc 'Run syntax, lint, spec tests and coverage'
+  task :cov => [:syntax,:lint,:spec_prep,:spec_standalone]
+end

spec/classes/coverage_spec.rb

@@ -1 +1,5 @@
-at_exit { RSpec::Puppet::Coverage.report! }
+require 'spec_helper'
+
+if ENV['COV']
+  at_exit { RSpec::Puppet::Coverage.report! }
+end