Update fib_calc.java

added recursive fibonnacci function (your original version is fine, just doing a lot of extra work)

style and convention changes

removed static designation of fib function
Rename fib_calc.java to FibCalc.java

file name change to reflect class name
Rename store.java to Store.java

file name change to reflect class name change
Merge pull request #1 from nocciolatte/master

pull request test