Merge pull request #104 from rupnikj/TStr

T str
own constructor fix
Merge branch 'TStr' of https://github.com/lstopar/qminer into TStr
own constructor
Merge branch 'TStr' of https://github.com/qminer/qminer into TStr
Merge branch 'TStr' of https://github.com/rupnikj/qminer into TStr
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