[boost] [rational] 1.68.0 merge permission

Subject: [boost] [rational] 1.68.0 merge permission
From: James E. King III (jking_at_[hidden])
Date: 2018-07-14 17:14:53

The addition of pow() for rational was identified as a problem in beta
testing.  It has been reverted for now, and an issue added to the github
repository to revisit it after 1.68.0.  There are two commits I would like
to merge to master:

1. The revert of pow which caused problems
2. A CI-only change to .travis.yml that fixes codecov.io and coverity scan
build jobs in light of recent security upgrades in travis CI.  No
production code changes, zero affect on the release build workflow.  This
will allow the build status to remain green for the repository as it is
merged to master.

Thanks,

Jim