add InputVerifier to UI to prevent input of non-integer value for skip lines
remove TODO comments
generalize skipLines input verifier as IntegerInputVerifier
handle scenario where skipLines missing from a saved test plan
normalize indent to 4 spaces (instead of 3)
added unit test cases for skipLines property
Merge remote-tracking branch 'upstream/master' into variables-from-csv
explicit import of Swing classes
Merge pull request #7 from mfremont/variables-from-csv

input validation for skipLines