Fix help message for Cluster's --features argument

The Cluster app's help message for the --features argument was
previously printing out the possible values for distance functions
rather than the possible values for features.
Merge pull request #10 from njwilson/fix-features-help

Fix help message for Cluster's --features argument
Added files for checking HW2.
Increase version to 0.3.0
Add stub files for HW4.
Update README, prepare for 0.3.0 release.
are u sure
HW3 answers
Merge remote-tracking branch 'upstream/master'
Add --output-dispersion (-d) option
Implement support for the --show-dispersion option
Merge pull request #11 from njwilson/output-dispersion

Add option for outputting dispersion
Merge branch 'master' of https://github.com/utcompling/applied-nlp

Conflicts:
	src/main/scala/appliednlp/app/Cluster.scala
HW 4 Classification
HW 4 Classification