updating version number and ChangeLog.txt
Merge branch 'release-0.8.12' of github.com:Azure/azure-sdk-tools-xplat into release-0.8.12
skipping storage file tests fail in Travis CI node version 0.8 on time out issues
Merge branch 'release-0.8.12' of github.com:Azure/azure-sdk-tools-xplat into release-0.8.12
Merge pull request #1447 from amarzavery/release-0.8.12

Release 0.8.12 version changes