#27 Added abstract StringNumber, created StringInteger and StringDouble from it, added StringDoubleList copying StringIntegerList format. Small change in import in InvertedLemmaIndexMapRed
#27 implemented JUnit tests. Cannot (easily at the moment) test readFields in all the String__ classes
Merged master into branch
Merge pull request #31 from gekonwi/steven.27.StringDouble

#27 Added abstract StringNumber, created StringInteger and StringDouble ...