removed moment (don't be dependent on moment .. if one wants to use
flexible date-parsing it should be done outside of this package)
use analyzerFactory

removed prepareIntValue/FloatValue/DoubleValue/LongValue
they may be found in utils
added documentation
added convertDate which is used in both, createFiled and for
query-building
all prepare functions moved from index to utils
SimpleIndex.prototype.query now demands a lucene-query-object
added createQuery creating a query defined with a plain js-object and
honoring the defined type of each field. it also makes range-queries
possible
all prepare-functions moved here
testing testing testing..
automated tests have to be done yet