V0.1.2 tweaks to remove version dependency from CLI output

[yuanzhou]

• using <causal-cmd-jarfile> to indicate the actual jar file name that is being used
• updated docs and pom version

Previously the output was:

usage: java -jar causal-cmd-0.1.1.jar --algorithm <arg> | --simulate-data <arg>  [--version]
    --algorithm <arg>       FGESc, FGESd, GFCIc, GFCId
    --simulate-data <arg>   sem-rand-fwd, bayes-net-rand-fwd
    --version               Show software version.

Now it is:

usage: java -jar <causal-cmd-jarfile> --algorithm <arg> | --simulate-data <arg>  [--version]
    --algorithm <arg>       FGESc, FGESd, GFCIc, GFCId
    --simulate-data <arg>   sem-rand-fwd, bayes-net-rand-fwd
    --version               Show software version.

@kvb2univpitt please review and merge if it looks good. Then

• push the changes to development branch after merging.
• merge changes to master branch and tag v0.1.2
• pull changes to branch v0.2.x to make it even with development branch

Thanks!