fix bug 1043565 - Remove 'vendor' directory check

This problem did not surface in the Jenkins build because the build
isn't completely cleaned each run.
Merge pull request #2243 from bramwelt/fix-bug-1043565-remove-vendor-dir-check

fix bug 1043565 - Remove 'vendor' directory check
fixes bug 1043681 by putting the build number into the file JENKINS_BUILD_NUMBER
Merge pull request #2245 from lonnen/build-num

keep track of the jenkins build #
Revert "keep track of the jenkins build #"
fixes bug 1043681 but for real this time, tho
Merge pull request #2246 from mozilla/revert-2245-build-num

Revert "keep track of the jenkins build #"
Remove exported env vars from build.sh

* Reformats make test call.
Change DB_HOST to database_hostname in Makefile

Fixes bug 1043526
Fix rabbitmq variable typo
Add default environment variables to build.sh