add `-NoLog` flag to all invocations of `megacli`

To suppress the `/MegaSAS.log` file from being created by the megaraid
related facts, per issue #25.
add all module supplied facts to README

Per issue #24
tweak README formatting of facts
tweak README formatting of facts (again)
Merge pull request #27 from jhoblitt/feature/megaraid_facts

add `-NoLog` flag to all invocations of `megacli`