Merge pull request #13 from ihcsim/master

Fix Broken Unit Tests And Inconsistent Indentation
use HashSet and Collections in FileHelper to fix ordering (also see issue #12)
Merge pull request #14 from ihcsim/master

Date-Related Helper Methods
Merge branch 'master' of github.com:ihcsim/HelperTools
fix test failures -> reason unknown, but it doesn't happen without the surefire-plugin (surefire reports are generated nevertheless)
Revert "fix test failures -> reason unknown, but it doesn't happen without the surefire-plugin (surefire reports are generated nevertheless)"

This reverts commit fdd364b2fb82f20774f1f04e3a369863136a3411.
Removed the DataInputStream decorator.
Refactored the buffered reader and kept the decorators to be readers.
Added two overloaded methods for readLines()
CheckStyle
Added readLines() tests
Merge pull request #17 from vjames19/FileReaderReadLines

FileReader read lines to a Collection of Strings
added overloaded join method for a Iterable
Reverse method
Added a null check for the separator
Added tests for reverse and join iterable
Added indexOfDifferences and its test
Doc for indexOfDifference
Merge pull request #18 from vjames19/MoreStringUtils

More StringHelper!
fix issue #19: NetHelperTest failes