when unpacking zip entry fails, then add better failure message (containing zip entry name)
fixed following tests failing on windows (because of locking file): ZipsTest.testInPlaceAddEntry() and ZipsTest.testInPlaceAddRemoveEntries()
fixed adding files from directory based on accept filter, it also fixed test (that failed only on windows): ZipsTest.testAddEntryFilter()
improved tests that used to fail only on windows
catch IOException instead of ZipException
Merge pull request #49 from atsu85/master

fixed zt-zip issues with windows