Remove 'provided' from storm-kafka pom.xml example

Per this documentation, the kafka dependency of storm-kafka is in the
'provided' scope so that users can choose which Scala distribution they
include.

Thus, this example of how to fulfill the dependency should not itself use
the 'provided' scope, or else kafka will still not be included.
Update README.md

minor typos that tripped me up today!
Merge branch 'fix_storm-kafka_pom_example' of https://github.com/patricklucas/storm
Merge branch 'patch-3' of https://github.com/lukedemi/storm