Can list files in a folder without need to filter by file extension.
Added API to feature space for reading dimensionality of individual feature extractors. Added first attempt at PU learning to analytics.
Added new date feature extractor. Multinomial and BagOfWords extractors can pull in multiple fields in one extractor.
Merge branch 'master' of github.com:qminer/qminer

Conflicts:
	src/glib/mine/ftrgen.cpp
	src/glib/mine/ftrgen.h
	src/qminer/qminer_ftr.cpp
	src/qminer/qminer_js.cpp
	src/qminer/qminer_js.h
Merge branch 'master' of github.com:qminer/qminer

Conflicts:
	src/glib/mine/ftrgen.cpp
	src/glib/mine/ftrgen.h
	src/qminer/qminer_ftr.cpp
	src/qminer/qminer_js.cpp
	src/qminer/qminer_js.h
(Compiler warnings)--
Merge branch 'master' of github.com:qminer/qminer
Merge branch 'master' of github.com:qminer/qminer

Conflicts:
	src/glib/mine/ftrgen.cpp
	src/qminer/qminer_js.cpp
Fixed bug in template
Merge pull request #66 from blazf/master

New and improved feature extractors, LU learning attempt #1