Merge pull request #7 from ant1/master

Fix a typo
updated for MacOS 10.8
updated for MacOS 10.8
removed regex.h---the #include was not needed
allows different delimiters to be specified for carving
updated
added some checking
added some checking
cleaned up a bit
cleaned
minor
Merge branch 'master' of github.com:simsong/be13_api
better support for memory-histograms
more updates for in-memory histogram
works with histogram callback
better const correctness; removed using namespace std
histograms now moved directly from scanners to feature_recorder_set
moved histogram generation to the feature_recorder
moved histograms to feature_recorder
added comments