Move Coveralls setup to be first in spec_helper

According to Coveralls documentation, this must be the first code in
your spec helper in order to properly calculate coverage.

Change-Id: Ifc457d5be2babaed219e07fdb11f8ff194386770
Reviewed-on: http://gerrit.causes.com/47714
Tested-by: jenkins <jenkins@brigade.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>

Author: sds

spec/spec_helper.rb

@@ -1,9 +1,10 @@
+# Bootstrap code coverage instrumentation. This must happen first!
 require 'coveralls'
+Coveralls.wear!
+
 require 'overcommit'
 require 'tempfile'
 
-Coveralls.wear!
-
 hook_types = Dir[File.join(Overcommit::OVERCOMMIT_HOME, 'lib/overcommit/hook/*')].
   select { |f| File.directory?(f) }.
   sort