add an `append_timestamp` configuration value

This value will be used to indicate whether a timestamp should be 
appended to the build version.
wire `append_timestamp` config value into Omnibus::BuildVersion

For backward compatibility we will still prefer the value passed in via
the `OMNIBUS_APPEND_TIMESTAMP` environment variable.
set Omnibus::Config.append_timestamp based on --timestamp

This will preserve the existing behavior of leaving the timestamp off
the generated build version with the `--no-timestamp` CLI option.
print the build version when the build commences
Merge branch 'CHEF-4112'
add Travis CI support
Add Travis CI and Code Climate badges to the README
v1.0.2
add baseline validation for software dsl
add libuuid to the whitelist
loosen jre whitelist entry to allow anything installed under jdk as well