make VariablesFromCsFileReader more testable by allowing BufferedReader input instead of just a file.
fix warnings caused by unchecked use of unparameterized HashMap
whitespace cleanup
allow input lines to contain more than 2 columns. add additional unit tests for variable prefix, input with only one column, and blank lines.
add option to skip lines at beginning of input
add VariableFromCsvFileReader unit test for missing separator
add option to UI to skip initial lines of input. refactor unit test for TestCsvFileAction to increase overlap of unit test with functional code and use mockito.
accept VariableFromCSV enhancements https://github.com/undera/jmeter-plugins/pull/5
accept VariableFromCSV enhancements https://github.com/undera/jmeter-plugins/pull/5