update commons-lang to version 3.1
replace usage of restricted class sun.misc.IOUtils by org.apache.commons.io.IOUtils
update commons-io to 2.4
add a test for one of the cases in issue 29
* do some calculations once in the constructor instead of for every evaluation of the filter
* make ArrayEvalFilter.ConditionStatement and PathTokenFilter static
use an enum for the expression operator
use the json provider to create a new list for the results
Merge branch 'dont-use-restricted-api'
Merge branch 'performance-improvements'
Merge branch 'use-json-provider-for-results'
Merge branch 'update-commons-lang'