added method unshift to TJsVec
Added constant type to feature extractor.
Merge pull request #1 from bkazic/master

Pull request
GetTypeNm and TTypeNm return clean class names in GCC.
TXmlDoc has method SaveStr that returnes TStr directly (and not via referenced argument)
TSAppSrv now returns all default stuff in JSon, and not in XML as before.
Fixed bug with IDF in the case of hashing bag of words feature generator.
Added script to start qminer as server in the movie example
Batch model works with string field as target and can return top predicted label.
Added admin website first attempt
TRec now returns milliseconds in JSon serialization for datetime fields.
Several changes:
 - fout.writeLine() writes an empty line to output stream
 - command line argument -prerun checks the return error code and reports if not zero
 - added server function /qm_status which returns the current memory status, with plan to add more information about the current qminer instance
 - commented out reload functionality for now, until it's fixed
Updated feature space example
Merge branch 'master' of github.com:qminer/qminer
Update qminer.js
snap warnings fixed, doc updated