Configuration: Fix setting rails_cache_store via environment variable

Environment variables can't have Symbol values.
Merge pull request #901 from opf/fix/cache_config_via_env_var

Configuration: Fix setting rails_cache_store via environment variable
choose correct reporter.
make tests timezone independant.
Changelog.
Merge pull request #902 from opf/fix/grunt_xunit

choose correct reporter.
remove branches from .travis.yml

It is too hard to run travis on forked repositories.
It disturbs pull request process.
add sqlite to .travis.yml